diff --git a/core/src/mindustry/game/Schematics.java b/core/src/mindustry/game/Schematics.java
index c9c76c4cca..6784100940 100644
--- a/core/src/mindustry/game/Schematics.java
+++ b/core/src/mindustry/game/Schematics.java
@@ -25,6 +25,7 @@
 import mindustry.input.*;
 import mindustry.input.Placement.*;
 import mindustry.io.*;
+import mindustry.type.*;
 import mindustry.world.*;
 import mindustry.world.blocks.ConstructBlock.*;
 import mindustry.world.blocks.distribution.*;
@@ -289,7 +290,9 @@ public FrameBuffer getBuffer(Schematic schematic){
     /** Creates an array of build plans from a schematic's data, centered on the provided x+y coordinates. */
     public Seq<BuildPlan> toPlans(Schematic schem, int x, int y){
         return schem.tiles.map(t -> new BuildPlan(t.x + x - schem.width/2, t.y + y - schem.height/2, t.rotation, t.block, t.config).original(t.x, t.y, schem.width, schem.height))
-            .removeAll(s -> (!s.block.isVisible() && !(s.block instanceof CoreBlock) && !(s.block.name.matches("^(item|liquid)-(source|void)$"))) || !s.block.unlockedNow()).sort(Structs.comparingInt(s -> -s.block.schematicPriority));
+            .removeAll(s -> (!s.block.isVisible() && !(
+                s.block instanceof CoreBlock || (s.block.buildVisibility == BuildVisibility.sandboxOnly && s.block.category != Category.defense /*Exclude walls*/)
+            )) || !s.block.unlockedNow()).sort(Structs.comparingInt(s -> -s.block.schematicPriority));
     }
 
     /** @return all the valid loadouts for a specific core type. */
diff --git a/core/src/mindustry/input/DesktopInput.java b/core/src/mindustry/input/DesktopInput.java
index d1d5e0ff90..09c6d78320 100644
--- a/core/src/mindustry/input/DesktopInput.java
+++ b/core/src/mindustry/input/DesktopInput.java
@@ -32,12 +32,14 @@
 import mindustry.game.*;
 import mindustry.gen.*;
 import mindustry.graphics.*;
+import mindustry.type.*;
 import mindustry.ui.*;
 import mindustry.ui.dialogs.*;
 import mindustry.ui.fragments.*;
 import mindustry.world.*;
 import mindustry.world.blocks.logic.*;
 import mindustry.world.blocks.payloads.*;
+import mindustry.world.meta.*;
 
 import static arc.Core.*;
 import static mindustry.Vars.*;
@@ -878,7 +880,7 @@ void pollInput(){
         if(Core.input.keyTap(Binding.pause_building)){
             if (Core.input.shift()) isFreezeQueueing = !isFreezeQueueing;
             else if (Core.input.ctrl()) {
-                Seq<BuildPlan> temp = frozenPlans.copy();
+                temp.set(frozenPlans);
                 flushPlans(temp, false, false, true);
             }
             else {
@@ -909,7 +911,9 @@ else if (Core.input.ctrl()) {
             if(Core.input.keyDown(Binding.break_block)){
                 mode = none;
             }else if(selectPlans.any()){
-                flushPlans(selectPlans, isFreezeQueueing, Core.input.keyDown(Binding.force_place_modifier), isFreezeQueueing);
+                flushPlans(
+                    temp.selectFrom(selectPlans, s -> !(s.block.buildVisibility == BuildVisibility.sandboxOnly && s.block.category != Category.defense)),
+                    isFreezeQueueing, Core.input.keyDown(Binding.force_place_modifier), isFreezeQueueing);
             }else if(isPlacing()){
                 selectX = cursorX;
                 selectY = cursorY;
diff --git a/core/src/mindustry/input/InputHandler.java b/core/src/mindustry/input/InputHandler.java
index 4db80cbf03..bd6aa5a249 100644
--- a/core/src/mindustry/input/InputHandler.java
+++ b/core/src/mindustry/input/InputHandler.java
@@ -90,6 +90,7 @@ public abstract class InputHandler implements InputProcessor, GestureListener{
     public BuildPlan bplan = new BuildPlan();
     public Seq<BuildPlan> linePlans = new Seq<>();
     public Seq<BuildPlan> selectPlans = new Seq<>(BuildPlan.class);
+    protected Seq<BuildPlan> temp = new Seq<>(BuildPlan.class);
     public boolean conveyorPlaceNormal = false;
     /** Last logic virus warning block FINISHME: All the client stuff here is awful */
     @Nullable public LogicBlock.LogicBuild lastVirusWarning, virusBuild;
@@ -1367,7 +1368,8 @@ protected void flushSelectPlans(Seq<BuildPlan> plans){
     private final Seq<Tile> tempTiles = new Seq<>(4);
 
     protected void flushPlansReverse(Seq<BuildPlan> plans){ // FINISHME: Does this method work as intended?
-        flushPlans(plans.copy().reverse());
+        temp.set(plans);
+        flushPlans(temp.reverse());
     }
 
     public void flushPlans(Seq<BuildPlan> plans) {
@@ -1631,47 +1633,38 @@ protected void freezeSelection(int x1, int y1, int x2, int y2, int maxLength){
         freezeSelection(x1, y1, x2, y2, false, maxLength);
     }
 
-    /** Helper function with changing from the first Seq to the next. Used to be a BiPredicate but moved out **/
-    private boolean checkFreezeSelectionHasNext(BuildPlan frz, Iterator<BuildPlan> it){
-        boolean hasNext;
-        while((hasNext = it.hasNext()) && it.next() != frz) ; // skip to the next instance when it.next() == frz
-        if(hasNext) it.remove();
-        return hasNext;
-    }
-
     protected void freezeSelection(int x1, int y1, int x2, int y2, boolean flush, int maxLength){
         NormalizeResult result = Placement.normalizeArea(x1, y1, x2, y2, rotation, false, maxLength);
 
-        Seq<BuildPlan> tmpFrozenPlans = new Seq<>();
         //remove build plans
-        Tmp.r1.set(result.x * tilesize, result.y * tilesize, (result.x2 - result.x) * tilesize, (result.y2 - result.y) * tilesize);
+        Rect r1 = Tmp.r1.set(result.x * tilesize, result.y * tilesize, (result.x2 - result.x) * tilesize, (result.y2 - result.y) * tilesize);
+        Rect r2 = Tmp.r2;
 
+        Seq<BuildPlan> frozenFromSelection = selectPlans.select(s -> s.bounds(r2).overlaps(r1));
+        Seq<BuildPlan> frozenFromUnit = new Seq<>(BuildPlan.class);
         for(BuildPlan plan : player.unit().plans()){
-            if(plan.bounds(Tmp.r2).overlaps(Tmp.r1)) tmpFrozenPlans.add(plan);
-        }
-
-        for(BuildPlan plan : selectPlans){
-            if(plan.bounds(Tmp.r2).overlaps(Tmp.r1)) tmpFrozenPlans.add(plan);
+            if(plan.bounds(r2).overlaps(r1)) frozenFromUnit.add(plan);
         }
 
-        Seq<BuildPlan> unfreeze = new Seq<>();
-        for(BuildPlan plan : frozenPlans){
-            if(plan.bounds(Tmp.r2).overlaps(Tmp.r1)) unfreeze.add(plan);
-        }
+        Seq<BuildPlan> unfreeze = temp.selectFrom(frozenPlans, s -> s.bounds(r2).overlaps(r1));
 
-        if(unfreeze.size > tmpFrozenPlans.size) flushPlans(unfreeze, false, false, true); // Unfreeze the selection when there's more frozen blocks in the area
+        if(unfreeze.size > frozenFromUnit.size + frozenFromSelection.size) flushPlans(unfreeze, false, false, true); // Unfreeze the selection when there's more frozen blocks in the area
         else{ // If there's fewer frozen blocks than unfrozen ones, we freeze the selection
-            Iterator<BuildPlan> it1 = player.unit().plans().iterator(), it2 = selectPlans.iterator();
-            for(BuildPlan frz : tmpFrozenPlans){
-                if(checkFreezeSelectionHasNext(frz, it1)) continue; // Player plans contains frz: remove it and continue.
-                if(/*!itHasNext implied*/ it2 != null){
-                    it1 = it2;
-                    it2 = null; // swap it2 into it1, continue iterating through without changing frz
-                    if(checkFreezeSelectionHasNext(frz, it1)) continue;
-                }
-                break; // exit if there are no remaining items in the two Seq's to check.
+            // Remove plans from their original locations
+            Iterator<BuildPlan> it = player.unit().plans().iterator();
+            boolean hasNext;
+            for(BuildPlan frz : frozenFromUnit){
+                while((hasNext = it.hasNext()) && frz != it.next());
+                if(hasNext) it.remove();
+                else break;
             }
-            frozenPlans.addAll(tmpFrozenPlans);
+            it = selectPlans.iterator();
+            for(BuildPlan frz : frozenFromSelection){
+                while((hasNext = it.hasNext()) && frz != it.next());
+                if(hasNext) it.remove();
+                else break;
+            }  
+            frozenPlans.addAll(frozenFromSelection).addAll(frozenFromUnit);
         }
     }
 
@@ -1916,7 +1909,7 @@ public float mouseAngle(float x, float y){
             );
             if(unit != null){
                 unit.hitbox(Tmp.r1);
-                Tmp.r1.grow(input.shift() ? tilesize * 6 : 6f); // If shift is held, add 3 tiles of leeway, makes it easier to shift click units controlled by processors and such
+                Tmp.r1.grow(allowPlayers && input.shift() && !unit.isPlayer() ? tilesize * 6 : 6f); // If shift is held, add 3 tiles of leeway, makes it easier to shift click units controlled by processors and such
                 if(Tmp.r1.contains(Core.input.mouseWorld())){
                     return unit;
                 }
diff --git a/core/src/mindustry/ui/dialogs/SettingsMenuDialog.java b/core/src/mindustry/ui/dialogs/SettingsMenuDialog.java
index 82f3a36ecb..5bb2a350ca 100644
--- a/core/src/mindustry/ui/dialogs/SettingsMenuDialog.java
+++ b/core/src/mindustry/ui/dialogs/SettingsMenuDialog.java
@@ -1121,19 +1121,20 @@ public static class Category extends Setting{
 
             @Override
             public void add(SettingsTable table){
+                ImageButton[] arrowButton = {null};
                 table.add("").row(); // Add a cell first as .row doesn't work if there are no cells in the current row.
                 final Runnable onClicked = () -> {
                     collapser.toggle();
                     settings.put("settingscategory-" + name + "-enabled", collapser.isCollapsed());
+                    arrowButton[0].getStyle().imageUp = collapser.isCollapsed() ? Icon.downOpen : Icon.upOpen;
                 };
                 table.table(t -> {
                     t.add(title).center().growX().color(Pal.accent).get().clicked(onClicked);
-                    t.button(Icon.downOpen, style, onClicked)
-                        .update(i -> i.getStyle().imageUp = (!collapser.isCollapsed() ? Icon.upOpen : Icon.downOpen))
-                        .size(10f).right().padRight(10f);
+                    (arrowButton[0] = t.button(Icon.downOpen, style, onClicked).size(10f).right().padRight(10f).get())
+                        .getStyle().imageUp = collapser.isCollapsed() ? Icon.downOpen : Icon.upOpen;
                 }).growX();
                 table.row();
-                table.image(Tex.whiteui, Pal.accent).growX().height(3f).pad(4f);
+                table.image(Tex.whiteui, Pal.accent).growX().height(3f).padTop(4f).padBottom(4f);
                 table.row();
                 table.add(collapser).left();
                 table.row();
diff --git a/core/src/mindustry/world/blocks/power/PowerNode.java b/core/src/mindustry/world/blocks/power/PowerNode.java
index 3d65fb37e4..baf34bd2e6 100644
--- a/core/src/mindustry/world/blocks/power/PowerNode.java
+++ b/core/src/mindustry/world/blocks/power/PowerNode.java
@@ -224,7 +224,7 @@ public void getPotentialLinks(Tile tile, Team team, Cons<Building> others){
     }
 
     public void getPotentialLinks(Tile tile, Team team, Cons<Building> others, boolean skipExisting){
-        getPotentialLinks(tile, team, others, true, true);
+        getPotentialLinks(tile, team, others, skipExisting, true);
     }
 
     public void getPotentialLinks(Tile tile, Team team, Cons<Building> others, boolean skipExisting, final boolean syncWithServer){