It wouldn't be a good idea because it's punishing everyone (both with the congestion issue as well as with the SMN issue), despite only a few people being at fault. There are plenty of good reasons to afk in Jeuno, like waiting for shouts for events or trying to find buyers/sellers for items.
Also, what's the line? 20min? Many people would be d/ced unnecessarily. 1h? Wouldn't help because most people in Jeuno don't even afk that long.
