I've been derping around in the latest devbuild as of 2014-08-07.
I tried out the advanced controls for helicopters.
I ran into the same problem I had when trying to play TakeOn helicopters, and that is the absence of a neutral lift function.
Let me explain: I play with an xbox360pad and put the collective on the right stick, however it feels incredibly clunky to have to increase and decrease collective completely manually. This is something that only works well when you have a physical throttle, but the sticks on my pad all reset to a neutral position, and when the in-game throttle does not do the same, it feels incredibly counterintuitive.
So I would like the option to have the throttle reset to a neutral lift if you will, when no controls are touched and still keep everything else.