notification in private chat when other is leaving

Hello Marko,
thanks for your plugin!

In this thread dontcare mentioned some important points, I’m interested, too: http://wordpress.org/support/topic/quick-chat-reverts-the-previous-private-rooms-conversations-when-logging-out

One more: When User_A logs out or closes the private chat with User_B, there is no notification for User_B. He can go on writing and nobody reads it.
Would it be difficult to implement a notification for the private chat partner when the other is leaving (by logout and/or closing)?

Thanks in advance!
Fee

http://wordpress.org/extend/plugins/quick-chat/