i have the python system on mine and it works great, i think it was 350 installed plus i had them mount a shock sensor on the rear of my truck as well. my timer delay is 20 seconds i think. (it hasn't hit 32* or below yet here) I haven't had any problems on start up on cold nights/mornings.
If you have the analog air system. just when you shut down the truck set it for the heater or A/C mode, fan speed, temp, etc... and you will get a nice warm or cold truck after a few mins.
The seat warmers...are they on a switch? if so are they able to be used with the truck off? If they only work when the truck is on or idling then just leave them in the "on" mode, and when you remote start they will power up.
as you girls and guy know after long trips and town driving they advise to let the rig idle a few mins to cool down your turbo. for 20 bucks i have turbo cool down feature that will run for about 5 mins and shut it off. its not the same as remote start. with remote start (at least on mine) it will run for any programed time period then if you don't insert the key and turn to ACC it will shut off after the time is expired. so trips to the store or bank, i put the truck in remote start mode, take out the key, walk away arming the truck, come back in 10 or 15 mins and trucks still on and there... Mine is set for 15 mins. the longest i have heard is 60 minutes on the python system.
just thought id put in my two cents.....