Since setting the ventilator-software repository public kindof made this code public, too, I felt I might as well post about it.
Basically, I figured out how to use a SNES controller connected to my Prop board with PC games, using a bit of Spin code and some preexisting PC software. The Propeller code is specific to SNES controllers, but should be fairly easy to adapt to anything else you might imagine. Perfect for when you're too cheap to buy an actual USB adapter for your controller of choice.
Click here for code and instructions!