I want to see the owner of the save have control over the comments of his/her save, and his/her save only. I really hate it when people make comments like "lolol mine is better" or "lolwat i hate this save -1" on my save and I can't remove it because it doesn't violate any rule.
This would probably help the other people and the moderators because they no longer have to go "I don't like this comment! Can you guys help me remove it?". If people abuse it; fine, they can have their ways. It doesn't change anything since you probably won't be getting any more good from doing that.
Just use the Report button. The mods would prefer that anyway.Though it might take a long time for a response,they'd most likely remove any flame war or related comments when the report gets to them, and if there's still some bad comments/want a somewhat quicker response, you could probably message them or go to IRC and request that they remove the comments.