Another thing with the drop away; since the arrow is only in contact w/ the rest only about 7 inches of the arrow, there is a percentage of human error eliminated. Not completely mind you.....but partially.

I've seen folks who could never paper tune a bow install a drop away and shoot bullet holes very quickly.

Helical fletching was mentioned and is another advantage. The BIGGEST reason I don't like the 2 prong rests is the constant filing down of them by the arrow. Before long, the arrow drops between the prongs and you gotta start all over again.

Greg's idea sounds pretty solid though......Never thought of that.