I did'nt saw invite-only, its not exactly what I want but I could do with it. Unfortunately it doesn't work correctly. I can generate referal code but when I want to register a new user, I don't have the referal input field and when I click register it keep searching (make sense since I believe it want the referal code, but since I can't enter it) .
clarkwinkelmann I did try that also but I don't know why, when I create a new group (lets say Validated Member). They kind of master moderator. I can't add moderator to specific task but only Validated Members)
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Edit: I found why I can't have referal code, it collide with reflar user management extensions.