Was this ever sorted ?
I did a flight today and had both values in the firmware settings set to 0 (ArduPlane:FS_SHORT_ACTN set to 0 and ArduPlane:FS_Long_ACTN set to 0) but the plane did an RTL when i switched off the transmitter during a mission.
I'm Running an APM 2.6 on firmware version V3.2.3
I am trying to fly a mission from point A to Point B and land at B.
your transmitter should set keep PWM value when closed
I used Frsky radio receiver failsafe to trigger Mission (Auto) mode without the need for FS_SHORT_ACTN or FS_Long_ACTN. Please refer back to your radio failsafe mode.