APM + COMPASS_MOT

Hi guys! 

Is there a way to set the motor-compass interference on the ArduPlane? 

Parameters are there I just see not GUI to do the calibration. I normally I wouldn't ask, but the compass direction moves about 40deg between 0 and 100% THR.

Is there a direct calibration possibility? 

If not, I have been thinking of loading a Copter firmware, doing the calibration, writing down the COMPASS_MOT_X-Y-Z offsets and then reloading the plane firmware and adding the params manually. Could that work? 

Do I need to enable the COMPASS_MOTCT in order to have the COMPASS_MOT offsets working? 

BTW is there a way to tell which FW version is currently on the APM (I forgot to  write it down) so I can put back the same? 

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