Instead of making a new type of board, I want to allow for "tagging" on forums which is simply where you are allowed to edit the "tags" key of any board that is a child of your own forumable board via the front matter like this
---
board: myforum/some-topic
tags: closed, duplicate
---
And either the owner of /myforum or the owner of /myforum/some-topic can edit those.
When those are edited, the displayed title of the topic on /myforum would read as
[CLOSED] [DUPLICATE] some-topic