Except that there isn't. They don't hire a full crew of at least 10 guys for every gig. That would be ridiculous. There are cameras for the screens at every gig, but that's just three people, at the most, I would think.
I don't think it would be difficult to just hammer the notes with his left hand while using the Kaoss pad, and he definetly can control the treadle with the KP as well, as you can reassign what the midi port controls for the Digitech