I think you can bind two keys for a single skill, but can you do more if you want? I feel like Homer when he was designing his car:
Seriously though, I'd like to have a heal on my mouse, and on the left AND right side of my movements keys. That way, if I'm about to die, I can heal no matter what my hands are doing.

Seriously though, I'd like to have a heal on my mouse, and on the left AND right side of my movements keys. That way, if I'm about to die, I can heal no matter what my hands are doing.