Secondly, not allowing users to edit their posts AT ALL, is a serious detriment to useful discussions. I tend to type pretty fast to get an idea written down and then post it, occasionally needing to edit some typos or add an addendum. Users should be able to edit a post for at least a few minutes, maybe a half hour. This will cut down on trivial replies, and allow someone to edit a comment they regret writing. I have my technical support forum set to allow edits for 1440 minutes (24 hours). (I'm also using SMF).