A reactive filter would be nice as well. If you find that something is bothering you, click on a remove from chat option and it would remove all instances of that message, including in scrollback. Same could work for adding things. If you had removed 'sitting' emotes from main, but then wished to know when someone stood up and left in a conversation, click to add 'sitting' back into the scrollback. Could be further used to select just the messages of certain players or groups of player as well. I suppose you could consider that as a focus menu.