Allow a usergroup to edit posts..

[Chimpie]

Is it possible to allow a particular usergroup to edit their posts in a particular forum section indefinitely?

We have a usergroup that creates topics in their own forum section. Sometimes their content needs to be edited past our normal 15 minutes guidelines. Is there a way to give them the ability to edit their own posts indefinitely?

If not, I'm willing to pay someone to create this mod for me.

Thanks!