The B-222 also has an electric force trim which will hold the cyclic and collective in place.
So there is no problem releasing the controls on the ground or in flight.
Also on the B-206 it pretty easy to clamp the cyclic between your knees or legs and release the controls, preferred on the ground only though!
Also I find that the manual friction on bigger helicopters works much better than the R-22 - H-300 types.