Aaahh, the Scout, about the most testing thing there is in which to do autos, but the funnest thing to fly. I don't know what the aversion is to doing autos on grass, what are the inherent dangers? Our military skid helos unit only ever did them to grass and not one issue ever arose that I'm aware of, though we did have a Wessex do a night auto to a runway and put the tail wheel up through the tail cone, night autos were promptly banned.