@LoyceV, I am not saying that those legitimate users will be delighted if they have to wait more than 6 minutes, but in the last few days we have dozens of newly created accounts that manage to make 3-4 posts before being banned. I think that every beginner should therefore prove himself before he gets the opportunity to use the forum like everyone else - and if that means he has to wait 10 or 15 minutes between two posts until he becomes a Jr.Member, I don't think that would discourage most legitimate users.

Limiting newbie participation is very harmful for a community. Newbie jail will never return: I consider the newbie-jail period to have been extremely damaging to the forum. When barriers to participation are too high, then the best people often just won't go to the trouble of joining, and the people who are willing to jump through the hoops are often people who aren't good for the community: people with nothing better to do, scammers, get-rick-quickers, etc. Having a permanent newbie jail policy would improve things a lot in the short-term, but would end up being a fatal poison to the community.