January 6, 201511 yr In v392 you can't seem to unassign ability hotkeys after you've assigned them (or the function has been changed, but not documented). I also find that I'm accidentally assigning hotkeys pretty regularly so I might suggest that you make it so that something like ALT-clicking or SHIFT-clicking hotkeys assigns & unassigns the key or something, to prevent accidental assigning and unassigning of hotkeys.