Hi Jon,
regarding screen size, what do you thing about this idea:
For remoting with iphone/ipod/ipad or Android phone it is not nessesary to have the complete function set of the desk. I think it es more usefull to have a tiny tool to remote the dimmer channels and submasters while working on the stage (adjusting lamps or viewing scenes from different positions). So it would be nice to have the possibility to select one fader (i.e. via keypad or Prev/Next-Button) and then just one big fader on the screen that is easy to touch, even with a big thumb ;-)
Regards, Jo