For that forum, would it make sense to disable user-to-user chat entirely for the whole site?
I’m circling back to this topic, and I think this is the place we need to start. I’d take it one smaller step further and say all those related settings on that page should apply equally to chat. (Ignoring and Muting users, as well as the Allow List for direct and personal messages).
Having additional settings for chat may be something we get to later, but I think it’ll be important to first prevent chat from being a loophole for these settings (with the possible exception of Ignore?)