mlyle thx for answer and for the detailed explanation.
and that is what iwas doing in the past, and i had no way to select wich pair of motors spin, Is most like. fly inverted then flip and go up. But...
In betaflight some mixer values are touched during the flip mode, because the unique input i have to use is the roll/pitch stick, and the unique two motors spining when flip are the farest to the ground (depending of the roll/pich input given) that way the nearer ones do not spin smashing the ground.
returning to my initial question, can i assume is nothing special code written yet to do this (in dronin)?
thx in advance