My Renegade Latitude has push button start/stop which includes remote start as part of the system.It was one of the options when I bought it in May. I doubt if you will be able to find an after market unit.
I have had this unit for a couple of months now and it starts my car from almost anywhere at work, also starts it from anywhere i've used it in the local super walmart. Works better than any factory remote I've ever used...I found someone who has been installing CompuStar units for 20 years. Both he and this product come highly recommended. 1 mile range compared to the 800" you get with a factory unit...
...what I found interesting is they can upgrade the range on factory starters and even to those with your cell phone.