I'm going to guess that you won't see this implemented anytime soon. My reasoning is that pg is very busy, and that there isn't enough evidence of this being an actual problem to justify his taking the time to do this. Maybe if somebody coded it up and sent him a patch he'd consider it? Or not? Who knows?

Are excessive downvotes really a problem here? Maybe it's just the stories I pick to read, but I haven't really seen it, or even seen people complaining about it on any mass level.