Board Thread:Support Requests - Community Management/@comment-765166-20161223082434/@comment-9605025-20161223214222

I would guess not. Although I don't know for sure, there are several reasons why I don't think it is possible.
 * 1) In order to change the rights of a user group, you need to edit LocalSettings.php. For some time now, this page has been off limits except to Wikia staff.
 * 2) I don't see how the category would be detected prior to page rendering. Even if you are able to hide the option in the visual editor, anons could still add them through the classic text editor. When done this way, they take the form of an internal link.