Switch Default User Groups?

[AndreaBash]

I asked this over at vbulletin.com and they sent me over here. I'm just going to copy/paste what I posted there.
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I did a search and didn't find a definite answer, so I'm asking again. Sorry if this has been asked.

I have 2 user groups. One is 'Registered' and the other only allows access to a single forum.

When a new user is approved, they are automatically tossed into 'Registered'. Is there a way to automatically put them into the other group instead? Basically I want the other group to be default (or at least selectable).

It seems like you should be able to choose the user group for the member you are approving, but that doesn't seem to be the case.

My other admins aren't familiar with changing user groups and they really want this feature to be automatic and I really don't want to take the time to set up an exact duplicate of 'Registered' then move all of my users over to it if I don't have to.

Make sense?