Broadway - 7:06 pm on May 18, 2011 (gmt 0)
So I'm thinking about this. Google doesn't even need to have a WMT feature that lets you declare a non-association with a website. The 403 offers the solution.
Google simply needs to officially state that if you push back a 403 on an incomming link, google accepts that action as a declaration that you want no affiliation with them. The link should count for nothing.
Sure, now that I understand more about 403's it seems likely this is how they interpret them. But if so, just stating it officially would put a lot of people's minds at ease.