i have a gravis game pad with z axis and throttle axis too, it has a fastfire button.
unfortunatly it crashed in the time i COULD play jazz. now i cant play jazz, but it the gamepad works now. the most funny was when i broke the pad controller on a rude and insane wild game of jazz. it just brok like that so it isnt all that good. eventually my dad fixed my pad but whateva i mostly use keyboard for precission and chat and gamepad for fastfire.