Feature request: Multiple keybindings for the same action

[lflfm]

I changed my rotate binding to middle-mouse, but it would be nice if it could also be bound to the middle mouse instead of replacing the R binding. Same for variation, I wanted to do it with the mouse-button 4, but that removed the T binding so I left it.

You get the idea; the user story goes: As a player, I need to bind multiple keys/buttons to the same action So that I can have bindings work with mouse or keyboard simultaneously and therefore can play with just one hand, or both.