I want to lock out the engine starting when plugged in. The whole reason I bought this car was to NOT use gas. I do not care that the cabin isn't warmed as well as it could with the engine running.
I have had the engine start when the car was connected to a 220 volt charger for 10 hours so I know it was fully charged. I am also confident that the ambient was greater than 30 F, as the car was in my attached garage. I have a thermometer in my garage, so I am not guessing about the temperature.
Sorry to rant but I think this is a big deal because I want to minimize the use of gas and am willing to sacrifice heating performance.