I've noticed on some hunt'in shows that the newer hoyt bows (some of them) have a round wheel on the top side. Just wondering why and how difficult it would be?

Don't know which Hoyts you are talking about but Hoyt has not had a round wheel on their bows since 2002. Every bow they make has some sort of cam & 1/2 system on it.

They do have a wheel & 1/2. This may be what you are talking about. It's designed for the finger shooter that prefers a very gentle draw cycle and a soft wall.

Thats what I saw, thanks bigbulls.