I have the Python 2-way 574 model. Everything is retained, albeit the stock fob really isn't used (except you still need to carry it around with you because of the chip inside it that's necessary to keep the car running after remote starting it). There is a module called the iDataLink that was also installed to retain all of the stock FASTkey settings like the push button trunk opener, but again, you really won't need to push FASTkey buttons on the car since the new key fob already has the lock/unlock buttons as well as the trunk release.

 

The reason I like the fast key is the fact that I don't have to dig it out of my pocket. If the aftermarket alarm can retain everything that I do now, it would be great. I like the DEI with the phone functions since that way I would only have to bring one fob and I bring my phone with me everywhere anyway so it's nothing extra. But if I have to bring an extra fob from the aftermarket alarm, that's no bueno.

 

Does the Python retain the ability to use the button on the exterior door handle when the car is remote started?

 

Yes, it still retains it, but it's kind of pointless to use. When remote starting the vehicle the alarm is still on and the doors are locked. If you don't use the Python fob to unlock the car, the alarm will go off when you attempt to use the button on the door handle.

 

damn... I know pressing the button on the fob isn't much of a hassle but I hate the thought of bypassing the FAST system that I paid an asinine amount of money for.

 

Lol, I hear ya. Too bad it's something that isn't easily removable and sellable to someone who can actually use it. At least the trunk button still works, which is quicker than holding down the aux button on the Python fob for 5 seconds