One of the coolest things about this game is the unique ways that people come up with to mash the buttons. I would always use a pen balanced over my middle finger, while applying light pressure with my left ring finger to counter-act the button presses that i would rapidly press with my right hand. Although i don't have a dedicated machine anymore, i HAVE made some custom aluminum cheat devices to play the game with on a Mame cabinet. I should post some pictures or make a video to show what they look like. They work pretty well...