Ctrl+S hotkey to save.

[LiamKarlMitchell]

No description provided.

[grsky360]

You could take a look at #26
Or simple add script by TamperMonkey with this
@jpillora please review it, and merge it if no problem

    document.addEventListener('keydown', function(e) {
        if (e.keyCode == 83 && (navigator.platform.match("Mac") ? e.metaKey : e.ctrlKey)){
          e.preventDefault();
          window.root.save();
        }
      });

[LiamKarlMitchell]

Also clicking save (e.g. on an Invoice) should keep you on the page, not take you back out to the list view.