The zero airspeed autorotation is, as mentioned earlier, quite possible, and a very useful tool for getting rid of unwanted height if you're trying to get to a specific spot.
One of the myths about this is that it generates a very high rate of descent - I've seen mention of over 4,000fpm - this would be enough to make most people not want to get close to zero airspeed.
My experience in the Bell 206 series is that if a 60 KIAS auto produces 1500 - 1600 fpm, the zero airspeed auto will produce in the vicinity of 1800-2000fpm rate of descent.
And using Microsoft Flight Sim for 'training' will give completely the wrong impression - when you go to zero airspeed, the rotor stops - not the same as real life at all!