Being able to select which node to include/exclude in the drop-down list off all the possible nodes available on the graph

[LazyTurtle]

When I right click on the graph editor, the plugin presents all the possible nodes I can make. But when I have 10 or more nodes it tends to be confusing and I might not want all those nodes to be available for that specific graph, moreover the user needs a way to tell the plugin to list/not to list specific sets of custom nodes.