I still have this intermittent problem with throttle controlling aileron and elevator travel in FBWA mode on my APM2.0 on 3.4.
Sometimes in FBWA mode the more throttle I apply the less the aileron and elevator move. On zero throttle I get full travel. On full throttle they hardly move at all and it’s proportional to how much throttle I apply.
The strange thing is sometimes it doesn’t do it. Sometimes I switch everything on and all is fine. There’s no telling when it will happen.