Board Thread:Support Requests - Community Management/@comment-842519-20121219120148/@comment-3335785-20121219135541

Chat moderators is a usergroup designed to moderate Special:Chat.

I recall Call of Duty Wiki have a blog patrol usergroup that can edit user blog posts for maintenance and spam clean-up, but what you're describing is a little different. Editing the forum posts should be relatively simple, simply create a new usergroup and add the correct rights, threadedit would probably be the name of the right.

As for blocking users from adding comments, that would require an extension to Special:UserRights, which would then be accessed by people with the relevant right. The chat used to have a similar function (banfromchat), but was removed with it's latest major revamp.

I'm not sure if staff are willing to make such a change. If someone is disrupting the wiki, they are likely to do it further than posting on forums, in which case they should probably be blocked across the wiki as a disruption-only account. Feel free to ask them about it on Special:Contact/general, but don't get your hopes up.