@simon thanks for summarizing the options.
In my case only the last one would work. I want only a certain group (let’s call them wiki editors) to be able to create and modify wikis (in this category), but I want others to be able to reply. The use case is that using replies, anyone can suggest changes to the wiki, but only the group of wiki editors can actually make changes.
The downside as you point out is I’d have to grant all my wiki editors TL4 which I wouldn’t necessarily want to do. I just recently created a Leadership [lounge] so TL4 has a very specific meaning. I think my workaround would be to change the leadership category to be based on a Leadership group instead of TL4.
So I’d put in a feature request for wiki create/edit based on group.