First up, I havent read any other host AFK threads and so I dont know whats out there, but Im sure everyoe agrees it's the scourge of the game.
I propose that the host has to click a button after each one minute time signal comes up. This would show as a set of lights that every player can see.
one light is illuminated by the host each minute. Should the host miss more than two lights, he is deemed to be AFK and everybody leaves.
NF should have an AFK host room set up in the waiting area and perhaps three people would be required to report the host of the failed room.
The host should then receive punishment.