This is something other games have that I do not understand why we don't have. If someone is causing issues in the gmae and I find them annoying, my only options are to turn off chat, kick them, or take an abandon. I think a much easier way is to just let us blacklist people while in-duty. It's kind of silly to me we can't already do it.
So many arguments I've seen would be handled if you could just do that. People arguing over sound effect macro spam, passive aggressive fights in chat during a duty between players, etc. We could just bypass those if you didn't have to exit any duty you're in to actually use the self-moderation features the game already provides.