That's a great idea!
I have thought about connecting a games station controller (PS2, Xbox or similar) for playing Rockboy games before, but my initial idea was to use the remote port which is unfortunately disabled in Rockboy
It needn't be done through USB - it could utilise the remote port somehow...
Not sure if it will fill a few of months of my degree, but it's definitely a very cool idea.
Thanks for your input!