I have 115,000 miles on the SVT and just start her up, wait for the revs to drop below 1,000 and go. Same routine whether 100 degrees or 20 below (and try not to rev over 3k til normal temp). My 2�¢ - if you need a car starter to avoid being too hot or too cold for a couple minutes, you've got bigger issues than just your car. Letting the car idle any longer than that just wastes gas and puts more unneeded exhaust in the air.
