The more I think about this, the more it makes sense .. I want to go with a coilover / 935 style springplate rear suspension in the future, and it would be cool to lower the car AND have proper camber for WIDE rear tires.
I saw a pic of a 911 RSR buildup with 17x11 rears and in the article, they lowered the rear of the car and kept the camber in check with the camber boxes.
MAKE IT SO ! 
Sandeep