Disengage discourse
I honestly think that the there's no real point in having it around. If you want to end a comment chain just don't reply. If a user is spamming a comment then that already violates Hexbear TOC. The only thing "Disengage" does is allow that user to have the final word. If you try to make any point beside "disengage" then I feel you're abusing it to end a discussion without potential backlash. In this scenario, you're literally still engaging with the other user but you don't want them to engage back.
Disengaging should either require you don't respond to the final comment or it should allow the other user to respond to the points made in the disengage comment.
I'll be honest, I don't think we should allow someone to be passive aggressive just to save them the stress. If they're going to rage over the internet they'll find something to be mad about eventually.