Improving disconnection handling

Hi,

     Is it possible for the specification to expose more fine-grained 
information regarding disconnection? Currently, we can detect a 
disconnection ~5 seconds after it has occurred: 
https://groups.google.com/d/msg/discuss-webrtc/G5-U-lHWs10/qwa-xF3vFbsJ

     I don't like users staring at a "frozen" image for five seconds. If 
I had a way of finding out when the last video frame was received, I 
would fade out the video immediate after it begins hanging and fade it 
back in when it reconnects. What do you think?

Gili