g1smd - 5:08 pm on Jun 13, 2012 (gmt 0)
Google builds a list of URLs to crawl. Then they crawl them. Google does not provide a referrer as they crawl. So, no you can't block links from counting or not counting - except by making the requested URL return 404 or 410 for all requests for that URL.
By testing the referer value, you can block some of the other visitors that come from those sites after they click the link on that other site. That's as far as it goes for now.