I think it's a fantastic idea getting custom buttons mapped out for gamers with a "disability".
You have to take a few things into consideration though;
o Everybody has a different gameplay style, no matter what
o Not everybody uses the same button loadout
o Would you have to make a whole new controller, for example, for someone who is quadiraplegic?
I think it's brilliant that even with his disability, Chuck still manages to play CoD. Go Chuck, you show the non-NGU players how it's done!