Someone suggested a wish list so lets have at it.
All the functions that are currently on Cab2. This has to be the starting point.
If possible the ability to program hot keys for a variety of function. Like a button that always makes the PE Berk say "This is the Polar Express". Again this is all dependent on how the engine programming is as well. I suspect the call outs are randoms so this probably isn't possible.
Engine info that presents itself via the sensor track and WiFi Monitor such as odometer.