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I need to introduce a new user group so that new members cannot user signatures until they have five posts and have been a member for at least a week.

I cannot change the default user group which is "Registered Users" so I presume that I need to rename this group to "Full Members" and create a new user group called "New Users" which does not allow signatures and then create a promotion that transfers them to "Full Members" once they have five posts AND have been a member for a week.

I have a couple of additional questions:

1) I currently have more than 20,000 "Registered Users". When I create the "New Users" user group and create the relevant promotion will all those members who do not have five posts and have not been registered for a week be automatically transferred out of "Full Members" and into "New Users"?

2) Hypothetically, lets say that a member's email address becomes invalid before they have five posts and they are manually transferred into the "Users Awaiting Email Confirmation" user group. Should they update their email address will they be automatically shifted back to "Full Members" or will it detect that they have less than five posts and move them instead (correctly) to "New Users"?

Any help would be very much appreciated! :)