The LC in the X6M (and X5M) is not so difficult. Matter of fact, if you set your M button to Power mode, EDC on, and DSC to MDM, then all you need to do is hold the brake and accelerator at the same time, wait for checkered flag, and release the brake. Since I am in M mode all the time (which is just a memory setting, you could just set the car to all these settings all the time without having to press the M button) all I do is gas/brake and launch!
So effectively the launch control button in the SRT8 is a non-programmable M button. I don't understand why the confusion
