[foxAsteria]

I think we could take this one step further and simply request unlimited "Reaper modifiers." These would be keys that when toggled or held would open a whole new set of action assignments.

This way, we would not be limited to the 3 modifiers (and their combinations) of a regular keyboard. Using qwerty keys in combination with ctrl/alt/shift/cmd is unintuitive anyway. E.g. We should be able to do things like hold down "s" as a "select modifier" and hit "a" to select all. Ctrl+a is only intuitive because it's pretty standard by now.

This would also extend the usefulness of any MIDI controller. My NI Maschine for instance already works this way in standalone mode; the center column of buttons are all momentary modifier buttons (Select, Solo, Mute, View, etc) used in conjunction with the drum pads. In MIDI mode this functionality is stripped since the modifier buttons become standard triggers or toggles.

Having any key or MIDI message operate as a modifier should streamline workflow like nothing else. Imagine how this could improve Mouse Modifiers. Hold a key that makes sense to you to perform certain types of action with the mouse.

Ctrl, Alt, Shift are pretty arbitrary, but letters and/or labelled buttons would be far more intuitive.