Thanks for your replies. This wasn’t necessarily a request for more moderating. I was thinking the original poster could decide to close his/her thread, or flag it for auto-closure, or that the system could just auto-close a discussion after some number of replies, with a message like “this thread is reaching its contribution limit and will auto-close at 100 replies. Please start a new thread if you want to extend the discussion.” In other words, it doesn’t have to feel like being moderated. I realize these ideas would probably require feature requests but I’d upvote them.