Not sure if push to start is even a possibility. I don't know how you would get around the steering wheel lock out. It would be super lame to have a push button start that only worked if the key was in the ignition.
Remote start would be nice. I put in a Viper Alarm that I could add this to later but it was such a PITA on my tC (manual). You had to do some stupid sequence everytime you turned off the car and that only worked half of the time. Brake, Clutch, Neutral, Release Clutch, then E brake. Or maybe it was clutch then brake. It was a PITA and with as small as the cabin is on this car it cools off super fast anyway. I may change my mind on our first ice storm though. With the frameless door windows I don't know how I will even get into the car to get the defroster going. It's been a couple years since we had a bad one but when you have a 1/4" sheet of ice on the car I suppose I won't want to even chance the roads.