My friend has a Tesla 4wd; he had a minor accident which was totally avoidable. The problem was the car's automatic features MADE him slide off the road!
Regenerative braking automatically slowing the car without him pressing brakes is what triggered the sliding motion. Then it seemed that other behavior triggered as he tried to steer and NOT press the brake or even at the last sec he tried to accelerate a bit to stop the regen. too late but he didn't hit quite as bad as he gained a little control.
The lesson here is that you should not have any automatic regeneration in the cold unless the driver explicitly presses on the brake and also to test the traction control systems in out of control situations. I doubt they are smarter than a seasoned skilled driver (my friend) who does not need to be fighting with the car in those situations. Until you can beat a human, you should consider disabling some features when it is too cold outside. At least make the user decide to leave it on when it is cold out.