User blog comment:Sarah Manley/2012 - A Great Year for Wikis/@comment-460966-20121221220054/@comment-4139585-20121222005608

Multi PM, /me, and notification sounds are part of Moncho's chat hacks script. You can ask him about it to learn more. There is also an ignore script by Madnessfan.

As for swear filter, you can add a transparent emoticon to your MediaWiki:Emoticons and then add a list of words that you want to be censored. Hovering over the emote will produce the text that was typed in, but this is still better than having the word just in the chat.

I'm not aware of anyway to quote, and I'm pretty sure that customizing text won't work due to chat being in real time. There is probably some customization that can be made to make a button that changes the color of the text, but since text is in real time as I said before, every part of the text likely would have to be identical (same color, same level of boldness, etc...)