You can make an extra group for example NewMember. Set the rights for this group to the same rights as a guest, or a little bit more.
You can set that new members belongs to this group when they sign in. Then you can let a admin review the registration, and move the NewMember to the Newbies group.
The only thing that i not understand is, on what base do a admin determes the member is going to be a "full" member. Normally you do this on behaviour, but there is nothing to see in behaviour as they have no write or post permissions??
Gr, Peet
Sorry for the picture is being in Dutch.... I'am dutch 
Edited by thecount