Second question,
Have your team thought about, using both-hand combat? By that i mean combining Gaming Keyboard ( Everything in reach of your left hand) with the use of Mouse. With that not limiting, yourself to only WASD, Right-Click, Left-Click and Middle-Button. I believe, that the direct use of the auxiliar buttons (Q,E,1,2,3,4,R,F,Z,X,C,...) into combat, would open new possibilities to combat besides the old-fashioned Weapons Hotkeys.
Sincerely, Hook.