Football Outsiders charts how many PI calls each quarterback generates as part of their QB rankings.
You can see an example here and just look at history:
http://www.footballoutsiders.com/stats/qb
The other stat that has been thrown around is something apart of ESPN's QBR rating that's called "Clutch Weighted Expected Points Added on Penalties" (labeled PEN EPA).
Flacco blows that category out of the water over his career:
http://espn.go.com/nfl/qbr/_/sort/cwepaPenalties
Flacco puts air under the ball and the receivers come back to it. It's a great play and I would absolutely work on it in practice.
It's not even close.....amazing how many they get. I bet they practice it. lol
The ravens receivers are like soccer players. Every play they put on a a big act and solicit PI penalties.