Shoot Semi-Auto guns with automatic speed! This is a risk-free software mod, so there's no way you can permanently screw up your mouse/joystick.
The Xbox 360 can do it, and after following this tutorial, all you PC gamers can too! I'll show you how to do it with AutoIt, a free Windows automation language.
Note, if you don't want to write the script yourself, you can download the compiled version on step 5.