chewy - 5:02 pm on Mar 25, 2013 (gmt 0)
Rodger that RF!
Other reading suggests there are at least 2 QS type metrics - that which is shown (like toolbar PR) and that which is what is really going on (much like what we learn in advanced backlink analysis).
Fortunately, we have a reasonably decent view of what we're told are the actual queries, and that presently isn't being obscured as much as it once was.
Thinking this through (with all your help of course) has brought me to think up an advanced negative test case which I'll be running to see if I can boost ROI.