It's funny - While I was reading through the last thread I was able to find an AS350B3 RFM online in 30 seconds (despite the thread starter bemoaning the fact that he no longer had access to one) and when I came to post a response I discovered that the thread had been pulled. (Plus the thread starter removed from PPrune!) My take is that you can only select the governor to MANUAL to train for emergency procedures, and the only emergency procedure the RFM describes (apart from autorotation) is how to approach and land after a FADEC failure. Once on the ground you stay there.
How far do you think you would get with Airbus or your insurers, trying to explain a cooked engine or oversped rotor?