Excellent plugin .. I use it exclusively for chat on facebook, and rarely ever visit the website itself.
Just recently however, during a time of high bandwidth usage, (by someone else in the house) , the plugin failed to retrieve several new messages. Within the 5 hour interval the plugin hadn't appeared to have gone offline or stopped responding in any fashion, and only after I signed out and signed back in, via MirandaNG, did the it retrieve the messages.
I do have KeepStatus set to notify on connection issues and it didn't seem to have notified anything either.
Depending on what it is that might have caused that to happen, perhaps an option to check for unread messages could be added to the protocols' 'Services' menu as well.
Also, if there's still any hidden DB options, a list of those would be appreciated too.