mass move to another usergroup according to email address

[FamilyCorner]

I know how to user the Prune/Move Users section in the admin panel, however it doesn't have the option that I want so I am wondering if there's A) a way to do it OR B) a hack/mod out there somewhere that can.

I would like to move all AOL and Compuserve users to their own user group. This way I can create raw html clickable links for them and everyone else won't have to see them, I can email them separately.

I'd also like to know if there's a way to sort people into that user group upon registration by having some sort of if statement that see "@aol.com" or "@cs.com" and places them in there.

Crossing my fingers there's a way...

Thanks!