Forum Permission on per user basis

[bmt]

Searching through the forums here looking for a specific type of permission system for my forum. I am looking for a way I can allow a specific user access to a particular forum without doing this on a usergroup basis. I wanted to make it so I as the admin would have to edit that specific user and grant access to the forum. Does a mod like this exist? I see them where its based on post count but not this method.

Thanks in advance.