Not necessarily. That would only help if everyone used it. Otherwise it'd be another tool for the scrapers to claim legitimacy.
I believe they already ping Google to inform them of new content, it would be a natural extension of that.
Edit: I guess that only works if they're fixed IPs.
The issue though is if you write a blog and don't know to do this, the scrapers do know and nick your content and inform Google of "their" new article. At that point you're now seen as a scraper for an article you actually wrote because the real scraper plays the game better.
And that's the real problem - the scrapers play the game better than the rest of us because they can commit larger amounts of time to it (not having to waste time writing actual content and all).