Keep up the good work! I was paralyzed 10 years ago in a motorcycle accident (T-4 Para, complete), I run the pedal with my elbow, and feed with the same hand. (I know, totally different animal that what you have going on) It can be kind of tricky, I've tried some of the hand-operated torch controls, never found one I really liked. They are a pain to try and adjust while keeping a straight bead, and not dipping the tungsten. I liked the momentary switch best, but it wasnt wrth a damn for aluminum, you could only go maybe 3 inches before I got too hot. Alumium is what I mostly did. (Radiators).
Take care and Never give up!
Rudy