You should add Xbox 360 controller compability.
That's probably not going to be possible. The 360 controllers is designed to only work on 360 and windows. And it's not recognized as a regular usb controller. Same reason it won't work on the PS3 even though the PS3 will work with most other USB controllers. The only way this would be possible is with an adapter. http://www.xcm.cc/xcm_cross_battle_adapter_plus.htm
But even then it makes it emulate a PS3 controller, which will work now anyways.