As best as I can tell, right clicking on an enemy activates hotkey #1. Ideally I'd like to change it to map to an ability that isn't even on the hotbar (to save space), however, I can't even find a way to map it to anything else.
In preferences -> key bindings, hotbar #1 (don't remember if that's the exact term, I'm not at my gaming machine at the moment) maps to only one thing: 1 on the keyboard. The second binding is not bound to anything (including the right mouse button).
Is there any way I can at the very least map it to a different hot key, or ideally to an ability not on a hotbar?