honestly, in my opinion, instead of making a new staff group, and people can and will charge and blame them for everything that's going bad in chats (as they won't be able to monitor everything), you can conscientize (starting by yourself, if you aren't yet) people to use our beloved report button when this kind of stuff happens.

You aren't satisfied with staff work? Bother them to take care of situations that they are not.
You aren't being attended? Staff Complaints is there for that.

I think report system is good enough to make servers cleaner but it isn't being used. So you should ask players to make their work first instead of charging staff, we are a community and staff can't handle everything, players have their part of responsibility for make our community clean too!!