If I understand correctly, think i’m searching something similar thing to do in discourse settings. 
We’re developing a new version of our platform, where ngo’s can create online services to their focus groups. These services can include different features, like private or group chats, forum etc. Discourse seem to be a great feature option for forum type of discussion with its configurable features and easy integration into our main site and its logins with basic user rights etc.
While the overall trust level system sets good base for general discussion, we are also after 2 separate options for category moderation setting to override the base system in our certain private categories: moderate every message posted into certain category despite the users general trust level or moderate no messages posted into certain category despite the users general trust level. The “moderate everything” option is there to set for category i thinnk but no option to set “moderate none”. Could this latter one be achieved somehow? 