See, I understand how this is something that moderators would know about that most of us would not. I also understand that while most of us can decide that a particular conversation isn’t worth reading or a particular poster isn’t of interest to us, but mods have to read everything.
Ultimately I don’t think a gently worded caution is a bad idea. As a litmus test of “bad things” I see it as one that has a great potential for false positives, but obviously you aren’t talking about permanently banning people from the boards or sending angry letters to their parents, just putting up a message on the screen.
(I’ve now posted 22% of the posts in this thread, all of them responding to a single user! 
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