I live with a 3D joystick in my left hand and trackball in my right hand. Obviously I do this for 3D cad work. My arms barely move. I go out of my way to avoi

I live with a 3D joystick in my left hand and trackball in my right hand. Obviously I do this for 3D cad work. My arms barely move. I go out of my way to avoid the keyboard, even to the point of using the "mouse" for cutting and pasting.