Editing own messages after reply

[AkvariumasLT]

Hello everyone,

i can't find the setting (if it's implemented) to prevent users editing own messages after they get a reply. Forum search didn't give results i was looking for (probably i used wrong phrases).

Situation: Not all forum members are mature, so member1 insults member2, member2 replies same way. Then member1 edits his post and reports member2 to moderator.

Idea is to allow members edit their messages within time limit (this one i know how to set), but disable that feature if they get a reply even if the time limit didn't end. I believe someone had such question before. Any suggestions (except deleting members) are welcome.

If it's important - vBulletin version 4.1.x.

Thanks in advance