I can do that. Another option would be to set ReceiverActivity to onchange with the metadata write. Then during transmitter calibration all values are back to the original tuned values. That might be the best because then it strictly preserves the tuning done during the original review, but we have one less UAVO that is onchange by default. 

Incidentally, a mid-air reset leaving the board flying while armed isn't completely academic. I had one yesterday because the vibrations from the motor fed through to the gyros, which made the servos pull too much current and my 1A BEC browned out. Not really the software's fault, but it's just to say that it can happen that the telemetry connection be flooded by ReceiverActivity at an inopportune time.