To be honest, I don't think there is a way to run a scan. But, AFAIK, when a user logs in with an alt, it'll detect it. So say User A and User B are the same person. User B hasn't logged in since you installed the mod. User A logs in all the time. During an argument, User B logs in to back up User A, then it should automatically detect it and let you know. AFAIK, it won't automatically ban/move that user into any group.
This is just from my experience with the mod.
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