I'll look later, but there was a guy on Ebay selling various modded controllers. The big one was the one that put the XYBA buttons under it so your fingers were always touching them. Sort of like that FPS controller that was out some time ago. You use your ring and middle finger on each hand to push your buttons, guy says it'll make your game better because you're not using one thumb to push four buttons, but four fingers for four buttons... The guy also mods controllers for other games, like R6...
I think the D-pad mod would be a great one to add, just so that you don't have to move your thumb off the stick to chat.