Without external controller support (and hardware) these projects are all just proof of concept. That is, in this case you're still better of with an Android device and a controller via OTG/BT.
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iOS 7 is getting official external game controller APIs:
https://developer.apple.com/library/etc/redirect/WWDR/GameCo...
So there's a future for that.
You could also use an iCade or some other controller that uses the iCade protocol.