So, maybe I'm just bad at this, but it seemed to me that when I allow the flight engineer AI to tune the autopilot, he doesn't respond quickly enough to my changes in the flight state of the aircraft. In particular, if I've been cruising for a bit with the heading autopilot on, the nose will pull to the side when I enter a hover unless I manually manipulate the pedals and override the autopilot. For me, this is often worse than just turning the autopilot on and ignoring the drift--I might cruise in a bit of a sideslip if I leave the heading channel on, but I can also hover at any time without much pedal input.
For pitch and roll stabilization only, the flight engineer AI seems OK to me. But again, doing nothing isn't really that bad either.
EDIT: Huh, I actually don't think the AI engineer is supposed to be adjusting the heading--but the helicopter sure doesn't seem to hold heading in a hover worth a damn if I leave it on and fly around for a bit. Maybe it's just a coincidence... anyone know why this might be?