Tried today new on-screen joysticks function on Samsung Galaxy S3 android smartphone with OTG USB cable to telemetry 433Mhz module.
It works great! I've been able to control my quadcopter (Arducopter 32 on VRBRAIN control board) without any problem (even if I'm using mode 3 on my RC radio and Joysticks are Mode 2!)
With this new capability we are now able to control our multicopter from ARM to LAND with Ardupilot only without any RC radio intervention (better to have one in parallel...just in case....)
Thanks again Kevin for your effort!