After asking and discussing with the Staff, we've finally established one new User Rights Group in this wikia. It's called "Forum Administrator".
As a Forum Administrator, their job is to manage the forum: moderate, highlight/unhighlight, open/close all threads. They will also be the Administrator's helper on managing users. For the level of power, Forum Administrator lies above Chat Moderator, and directly under normal Administrator. The head of Forum Administrator will also have full Administrator priviledges.
For currently appointed Forum Administrator are: