TL;DR entire thread, but yes, you can just selecting the chassis, drivetrain, or both. On the 2013, when you select sport, you have the option to configure. Select that and it will take you to the right page.
I drive in sport chassis mode the vast majority of the time. It tightens up the feel of the car, but doesn't kill the milage.
2013 BMW 550i M-Sport - ZCW, ZDH, ZEC, ZMP, 2TB
2011 Ford F350 Crew Cab Short bed
2006 BMW 330i Premium, Sport, Automatic, Comfort Access
2004 Lexus GS 430, 2001 GMC Yukon, 1999 Pontiac Grand Prix GTP, 1997 Ford Thunderbird V-8