Quitting is a nuisance for others, yes. But I don't think that there's much that can be done. The WGT server really can't determine if the person's computer crashed or if the person him/herself has keeled over.
Naming quitters on forums: The way I figure is that he quit on me which makes him impolite, so if I post his name here, then I'm no better, am I?
One thing I wish I could have: A 'No-friend list'. That way I could add names of people I don't want to play with so WGT won't add me to any game they are already in.