Being able to change ability hotkeys in the ability screen.

Cutting away precious time and making things more efficient, it could come in handy that you could also change hotkeys to your abilities, within the ability screen while changing their places up. While it doesn't take that much time to go to your settings and change the layout of your buttons there, I think it could be quite useful to change them while fiddling with abilities, cutting away wasteful trips back and forth to settings.