That would be wasteful as it is only intended to be used to improve your charge rate (i.e only applicable to Supercharging)
I guess it could be used to speed up time to full Regen; for that I found out that spirited driving is quickest way to warm up battery!
Actually best way overall is to leave your car in a 60+F garage when not driving...
The reason I asked the #2, I had this experience the other day when pulled out of a cold garage (not 60+F) and drove 30 miles:
Battery cold (not Preheated) to start the drive - Heater on - 2 seats heated - Steering wheel heated) - Average speed 30 miles, local roads
Outside temperature 17F = -8C
The car used 50 RM for 30 actual miles driven
50/30=1.67 ==> 67% more miles used