PS Guys are we absolutely sure that the rear crew are not already technical crew members ? I can't imagine that the winchman is not, given that he must be interacting with the crew during winching operations ?
Punto, yes they are technical crew members but that, as I understand it, isn't the same as being allowed to be responsible for the navigation of the aircraft because they aren't licensed in the same way as a pilot or flight engineer.
However, that conveniently ignores the fact that when the winch operator is using the aux hover trim (or whatever it is called in the S92), he is flying the aircraft - perhaps because the pilot can over-ride him it doesn't count?
It also ignores the responsibility for tip and tail clearances when winching where, if he/she makes a mistake, it can be disastrous.