A track buddy who races an E92 M3 in NASA GTS4 consulted James Clay on his set-up. He tells me that the only change in the rear of the car (besides shocks/sway) were what he called "rear spring arm bearings."
Not really sure which bearing this might be. Any guesses?
EDIT: Found 'em! They're also known as rear camber arm bearings.
http://store.bimmerworld.com/bimmerw...px?Thread=True
And, yes -- I'd suggest an alignment with slight toe-in in the rear.
Neil