I got a Wikipad (an Android tablet that targets gamers) to experiment with as a ground station / second TX, mostly because it has dual joysticks. There is a lot of work to be done until it has RC-controller like capabilities. First step was a workaround for the design flaw that no USB data ports are exposed when you have the tablet snapped into the joysticks. I did the mod and then made this guide:
Hope you guys find this useful! I will be working to add Wikipad support to Droidplanner and maybe Andropilot too.