Abandon instead of resign

Usually the players who abandon lost games are the same ones who will start furiously adding time to your clock when they've stumbled into a winning position.

#6 this is a great idea. Until it is implemented (I hope the developers listen to what you say) the lesson is simple:

Don't play ridiculously long games or games with huge increments against people you can't trust. It isn't usually THAT hard to work out whether a player is trustworthy or not. Check their profile for prior record of abandoned games, for example.

#12 Thank you! The whole "punish" vibe in this topic is nonconstructive and I think #6 is a serious alternative, helping players to make informed decisions.

I agree with Toadofsky that this is a good idea. But is it enough? Do all of you check your opp's profile before making your first move in a 5'+2" game? Because I don't. Maybe it helps to make the abandon-percentage more visible somehow, I don't know.
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@Aquavibe. That's a misunderstanding. Deliberately running out of time IS against the rules, BECAUSE it's annoying. See FIDE rules below. The only problem is how to prove that your opponent is not thinking about what to move, but being a child.

"11.5
It is forbidden to distract or annoy the opponent in any manner whatsoever. This includes unreasonable claims, unreasonable offers of a draw or the introduction of a source of noise into the playing area."

#14 I'm sure that if the data were available, someone will make a browser plugin to help them conveniently check the opponent's profile...

Nobody can prove that a player deliberately ran out of time, although it's easy to determine "I don't want to play against an opponent who plays like that."

#15 +1

Basically, I'm voting for Toadofsky :)