gajim marks windows with pending events with "" in window titles. This could be extended in MUC - turn the "" into something special (like "$") if there was a "special" event (someone used my name, for example).
This would make it easy to, say, decide if the overnight logs of a MUC are worth reading. As long as there are special unread events gajim could use "$" instead of "*" in a window title (and perhaps something like "$20$" instead of "[20]"?)