Xnr,
This thread sounds like the coffee talk around the Sikorsky Pilot's office, where the Army pilots laugh at the Navy pilots about this subject. Since I was Army, I am duty bound to say "Pshaw!" But really, there is nothing very wrong with fighting trim when turning, if you don't mind fighting the aircraft whenever you maneuver. In the Army, we were taught that you have the most fun when you make your partner WANT to maneuver, if you get my drift!
Regarding the S-76 trim and IFR limits, the reason the trim is needed is that the IFR requirements demand that there be a stick force vs speed cue to the pilot, so that any increase in speed causes a rearward stick force to be felt by the pilot. This force comes from the stick trim, so no stick trim, no IFR.