So it looks like the tagging plugin and I assume, by extension, the integrated tagging supports “[restricting] who can tag to a particular trust level”, but I’m not seeing a way to restrict the creation of tags to a specific trust level anywhere. It’d be great if like on StackExchange, the creation of tags was restricted to certain permission levels. A good default imo is Regular since those users participate actively enough in the forum to know when it’s a good idea to add a tag, but of course, site admins should be able to configure this if they wish.
If you want a good reason for restricting tag creation to higher-level users, here’s a snapshot from the Discourse forum I regularly use:
We have some pretty irking tags like “resyncs_polls” (Resyncable is a user who creates spammy polls), “died”, “iamanidiot”, “massive_horde”, “helpplz”, “gksw” (someone created a tag for a member?), “beware”, etc. Needless to say, it’s become very apparent that most of the people on our forum should not have access to the privilege of creating tags.