Even though I don't use boss mode.... It sounds like a great idea.... I'm pretty sure Patchou could do it... I don't think somebody could make a plug-in to do this... But it would be useful to anybody who uses boss protection mode.
The only downfall would be that not everybody uses that same icon.... So what Patchou would probably have to do is have an icon for when there are no new messages... and have you pick an icon for when there are.
Just thought I'd give my 5 cents worth
