Mahz is planning on crafting the moderation system to allow GMs to remove disruptive posts from their thread without actually deleting the content. Quote taken from [url=http://www.roleplayerguild.com/topics/4135/posts/ooc?page=1#post-57340]this post[/url].

[quote=Mahz]This time I want to empower members to do basic things like re-title and move their topic. GMs should be able to "hide" user content, and hidden content is still visible to its creator (i.e. GMs shouldn't be able to destroy content). -- This is actually how even my delete button works except I haven't yet programmed the creator-can-still-see-it function. "Can you move my topic?" is such a waste of time for both the member and the moderator slave.[/quote]

That should serve your purposes just fine whenever it becomes a released feature.