[Greg Needel]

Originally Posted by AllenGregoryIV

We wired up our own board using a teensy microcontroller.
http://www.chiefdelphi.com/media/papers/2666

I believe the same can be done with a Arduino Leonardo but I'm not 100% sure.

You can do this. We used an arduino mega last year. Just google ardunio HID device and you will find plenty of examples. Basically what it Ira is emulate a keyboard, so you have plenty of button options.