My idea for this is to add a /shush command. When targeting an annoying NPC, the /shush animation will fire, and your character will no longer hear their repetitive dialog.
For instance, the guy who keeps asking about latrines next to Lion’s Arch leatherworker area, and the little girl who keeps screaming “Monsters!” at the bank. I would LOVE the ability to /shush them.
Yak’s Bend – Bellenisa (Ele), Bellesina (Thief)