Shytorque,
Glad you pointed that one out. We use to use a B222 on marine pilot transfers and the norm was to lose the door on short final due to the floats. We now use a BK117, which seems to be a little more forgiving when it comes to the doors. Although the rear sliding doors do come into contact with the floats whilst jettisoning, it dosn't stop the pax from getting out.
On the single engine stuff, I am under the impression that you will most likely need a small amount of power during the auto and flare if you have a 'basic' drive failure. All got to do with drag etc from the transmission.
One other thing to nut over. Does the tail rotor go into auto itself if you boot in right pedal during a drive failure (American heli's)? Maybe it could give an additional, albeit small, amount of stability to an unstable situation. (could you overspeed a T/R)
Food for thought if nothing else.