Dave,
I like your idea for automatic rotor control. A sport pilot would need that.
But I think the autorotational ability of any helicopter is inferior at low altitude, compared with a low wing loading ultralight type airplane. An ultralight can fly at 25mph at 50ft agl and glide in with a low impact velocity, in the case of complete power loss. A helicopter pilot would not fare as well, even with an instant automatic autorotation governor.
Of course, Nick would say here " dont worry about a miniscule chance of engine failure, you are more likely to experience HTG (hit the ground) from pilot error.
Thats the point, helos can bite in many ways.
I think my chances of actual flight in a machine of my design is more likely in a fixed wing with powered lift.
Nobody is working from this angle because vtol and vstol design has always been for military missions not sport. It is a huge difference in mission.
I am not sure what market you are designing for Dave. Is it sport or military/commercial?