they are already in the RU group as soon as they register. every registered member goes in the RU group. IF you choose to use the NRU to approve posts etc. then they will also go into the NRU.
once they have had the required number of posts approved, then are removed from the NRU and remain in the RU.
and, no, there is no way to do what you asked as there is no reason for it. If you are testing things then just create a new test user etc.
or, you can manually add or remove people from the NRU whenever you like.
never remove anyone from the RU. depending on if you have setup special groups and put people in them, removing anyone from the RU would eleminate all their permissions to view/read forums/topics
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