Battlefield 4 Key binding issues

hey, did anyone had a hard time binding keys to their mouse? I use a roccat kone xtd btw but i think other mouse owners have the same issue. If anyone has no problems binding keys to their mouse, please lmk how you did it.

Battlefield is an asshole, and so is the company behind it, they're too bloody lazy to sort things like that out, I can't do it either.