Ever get really annoyed at Arcanist Braedin? Well, at least just want him to shut up? Then "/plunk arcanist braedin"! Yay! No more spam.
Should work on just about any NPC or player, though it was really intended for the former. Main feature is that it took me less time to write than my fruitless search for these specific capabilities in an up-to-date addon.
Other features include: silencing achievement spam, foreign "language" spam, and whatever else I find convenient.
Besides "/plunk" and "/unplunk" there is a simple Interface Options configuration panel.