You can disable Stop/Start on the 2012's
"Stop/Start is active in the Controlled Efficiency ("C") transmission mode and switches the eight-cylinder engine off when the vehicle comes to a standstill. The stop/start function can be activated or deactivated using the ECO button on the centre console. When in transmission mode "C", the vehicle will always start up in second gear"
It's a feature tied to the MCT Tranny....
"The big change for 2012 is the AMG Speedshift Plus seven-speed MCT transmission. The race-quick gearbox uses a multi-plate wet clutch instead of a torque convertor to ensure as much torque as possible makes it to the pavement. It improves fuel economy through more efficient operation and also features a conservation mode with start/stop function"
http://autoeuropecar.com/mercedes-benz/2012-mercedes-benz-c63-amg-reviews.html
You would want to disable it at the track as you wouldnt want your car to shut off staging at the line
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