Ohgosh no. Exhibit A- Dillon (Gators). I know he'd be pulling certain stuff on people. XD
I just don't think editing comments is necessary. Y'all have seen certain people that say offensive things in comments. Once it's been said, they shouldn't be able to edit it and make it seem like they never said anything wrong. :o
It'd be nice, but not practical. Consider: Dodgy answers a question. Dozy comments on it. Dodgy points out that Dozy is an idiot and that the comment makes no sense. Dozy editors his comment so that now it does make sense. That makes Dodgy look like an idiot.
The whole comments thread would quickly become unusable.