"Hi Arturs,
I am also thinking of going down the same upgrade path. In the case of an A2, the shutter trigger would be tapped from F2. What about the N3?"
"I have tried the same method, and when I click trigger in the GS software when I set the GP Servo action, my camera takes more than 1 picture. I am not using a zenmuse gimbal by the way."
"Another way I think is to preset the behaviour in the DJI GO app that it will factor in the distance to return home when emergency return to home. Then you let the default behaviour of the drone in case loss of RC link to be continue."