I just happened to run across Meeko's posting from August 2014 on how to enable track mode on a Z4M. Didn't even realize I had a light on the dash for DTC (Dynamic Traction Control) as it had never illuminated, even when first turning on the ignition and all the warning lights do their brief test. I immediately hooked up my computer to my 07 Z4M and enabled "TDR" in the MK60 module and it works great! Now, a brief press of the DSC button turns on the DTC light and a two second press turns on the DSC light. Thank you Meeko! 
