It should be possible to develop a block heaters powered by the DC.
How about a grille shutter? It would even be good for the aerodynamics.
Other than engine block heaters that have to be plugged into AC power, we're pretty much out of luck in that department afaik. It'd be nice during winter if they could at least find a way to make heaters blow warm air faster, though .. I hate freezing my ass off waiting for the coolant to warm up!
2014 Mustang V6 3.7L 6-spd manual, with MGW shifter, Airaid CAI, BBK shorty headers, Corsa Sport axle back, strut tower brace, JLT oil separator, GT500 differential cover, BG Synchro Shift II gear oil, Redline differential oil.