I play with a trackball on my right hand. you could easily use that for your camera panning with nothing but your thumb and index finger. You can then use a razer keypad on your left hand, or any of the cheaper knock offs. They have a joystick that you can use your left thumb for all directional movement as well as 16 or more buttons to keybind your ever decreasing amount of abilities. might be a set up for you to try to improve your play.
- - - Updated - - -
Thank you. Sometimes with the nerve damage it just dont work right