At some level, think about that.
The req's right now are over a half pound, thats just silly. A case could be made for registering pilots flying a model over a certain size, I don't know what that size is but if it were me personally, I'd say anything over 55 pounds needing an LMA inspection the pilot could be registered.
The other thing the AMA is trying to push for, is to have an AMA membership meet the registration requirement.