Is it possible to turn the CC board on and off from the ground so one could fly a plane unassisted and then turn it on for a particular amount of assistance?
The board would still have to act as a go-between for the servos when it's off. Bart
Since I wasn't able to login until account verified, I can answer now for those who haven't realize it yet:
Yes, there is a support for 2/3-pos switch which can be used to switch CC FlightMode (don't confuse with the Tx settings, we probably should change the name).
Each of those 3 modes can be independently set to Manual/Stabilized1/Stabilized2/Stabilized3 and few more modes. In Manual mode you effectively use just on-board mixer. But for each Stabilized mode you can set which axes you want to stabilize in it, say,
Stabilized1: Roll=Rate, Pitch=Rate, Yaw=Rate
Stabilized2: Roll=Attitude, Pitch=Attitude, Yaw=Rate,
Stabilized3: Roll=Attitude, Pitch=Attitude, Yaw=None (means no stabilization)
As soon as one of modes is activated (using Tx switch), you instantly have desired behavior. And Rate/Attitude modes of course have their own stabilization settings.
BTW, it is the same what I used on my delta trying inverted flight and spin auto-recovery: I switched from Manual mode to Attitude-stabilized (or Rate-stabilized) mode (you may want HD to see the model better):
