In fact its pretty tricky to rebind keyboard keys...
Lets say its binded "w" for "move forward", when you click on that, and can add a key. Press "w" and its going to delete the key from the bind..
Like that you can delete key you dont want / need and add new one.
But yeah i spended like 30min to bind correctly that damned game... this crap console port do not even allow me to rebind mouse2, dont even recognize mouse 4 -5. And i freaking dont know why, do not allow me to bind the "a" key ( i have a azerty keyboard )
Nowday devs are really annoying -_-"
And NO i DONT WANT use a gamepad, i dont like that for ANY game where i need to control the camera.. for that mouse usage is 1 million time better.