I have used two types of external buttons with XCSoar
* Buttons connected to Vario - in my case Vega - but other have hardware inputs
* Buttons via Bluetooth device
I used one of these -
http://sell.lulusoso.com/selling-leads/632164/Bluetooth-GamePad-Bluetooth-GamePad-for-PDA-Pocket-PC-Smart-Phone-Bluetooth-Game-Controller-Game-p.html
(Not necessarily that one, or that place, but it looks like that).
Obviously, if you are using a IOIO, then it should be fairly easy.
Scott
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