Antonio requested a few IRC style actions for the groupchat to be invaluable for some users. Just checked in a small sample of them.
There are a lot of IRC commands and I just picked a few of them to start with since I'm a bit unsure exactly how some of them shall work. In addition, I added nick name completion, so if you start writing a nick name of any participant and press the Tab key, you will get the full nick name if only that matched, a beep if more than one matched, and an ordinary tab if none matched. Also added is some sound playing when your nick name appears in a chat, so you'd better wake up. All this could need bit more polish and customization, but this is at least something to start with.