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Ther is an old mod Post Count Requirements.
User need a minim number of post, set by admin in ACP, to can post in a topic.
Very userful for buy/change section.
Will be avaible something similar for 3.1.1?
Also the Extensions Team is currently working on an official auto groups extension that will probably do exactly what you want. viewtopic.php?f=64&t=2252451