Requesting a mod that allows users to reply, but does not bump the thread

[HondaATC]

Heres the scenario, we have a forum with a free classifieds section. It was really getting abused by some users and people who registered for nothing other then to sell their crap on there so we buckled down and got some pretty tough rules and made it where no one can reply to their ads (To prevent people from bumping and hogging the top spots. We get complaints all the time now about people having to answer PM's that could be answere in a reply, but we also get people who praise the fact that the ads stay in place and do not shift around. The only other thing is this has become a moderating nightmare, people wanting posts removed, edited, replaced, ect ect. So I came up with the idea, what if people can reply to the posts, but they do not change posistion on the forumdisplay.php page. What would be involved in doing that? It would really be beneficial to us I believe. Thanks for the help.