CainIV - 1:22 am on Mar 15, 2011 (gmt 0)

Like other search engines (including Microsoft's Bing), we also use exception lists when specific algorithms inadvertently impact websites, and when we believe an exception list will significantly improve search quality. We don't keep a master list protecting certain sites from all changes to our algorithms.

To me that is the exact same thing as saying:

Yes, under some conditions we do, and will, manually change results to impact our perceived vision of improved results.