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There is no such a thing as warped rotors. There is no way that pressing cast iron with a softer compound could warp the rotors. Like someone mentioned before the vibration is due to brake pad deposits that are caused by uneven cool down of the brake rotors. When you create heat by pressing the brake pedal and come to a stop leaving the foot on the brake causes the surface that has contact with the pad to stay hot while the rest of the rotor is cooling down;therefore a chemical reaction causes that a deposit of pad material to be deposited on the rotor forming an uneven surface which is not visible to the naked eye.
Your driving habits caused those deposits and you should make changes to the way you use your brakes. Excessive heat is your enemy and leaving your foot on the brake after generating excessive heat will contribute to vibrations on your braking system. Dragging the brakes generates heat and that's why people who drive that way usually experience brake problems.
Keeping your brakes cool when possible should be your state of mind. Try braking and taking your foot of the brake to slow down when you know that you will be approaching a red light or intersection and take your foot of the brake as soon as your car stop. The M3 DCT will allow you to do that.
Just my .02
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