Jack57,
What helicopters have you flown? With the control damping stabilization on, the KA-50 feels exactly like the S-76, the EC-135 and the 365N. As with the 76, stab off is much more difficult to fly and though it does help your control touch, it is not something that we routinely do.
The Collective Trim Switch (Or in KA-50 Collective Brake) resets reference altitude and also when held releases the spring pressure on the collective. This you press in any helo with an autopilot or stabilization system.
Alt-Hold and Heading Hold are separate auto pilot modes and can be selected/deselected as desired.
Rmako
This is not a challenge, just want to make sure that the point about the stab systems is not lost.