Of course better hardware in a computer is not cheating, but then again, if any hardware to enchant playing, as you say, is allowed and are not cheating, how about those hardware thingies called Action Replay?, it's also there for enchanting game playing, just like a autofire on a joystick is. Autofire on a joystick is just to help people in games, just like action replay... both are cheating ways, except better hardware for the computer like gfx card etc.
Then having the benefit of owning a joystick with autofire would be the same as having the benefit of owning an action replay. There are also joysticks with a slowmotion button... cheat cheat cheat...
The games should be meant to be played as they are, not with help.
Just what I think
, but guess "yes" for autofire will win anyway.