Board Thread:Support Requests - Getting Technical/@comment-24751993-20150323134545/@comment-452-20150323154355

I asked about this last July, and that type of "restricting functionality" is not allowed by the customization policy.

See http://dev.wikia.com/wiki/User_talk:Gguigui1#Sysop_threads for what was said about the "Sysop threads" script which does something similar.

Instead of using technical measures, you simply need to set a policy on the wiki that users should not post in those subforums.