unless you truly know how to handle your car, and I mean power wise as well as steering, I don't suggest anyone disable the DSC/DTC completely. Most people are not aware of how much power their cars have or how to handle the sheer mass of a 3600+ lb car.
That said, when I track my cars, i disable it all together. This is also he practice for launch assist in some vehicles and known to burn up ignition coils at a faster rate when used that way.
In the snow, unless you are on ice as well, enabling DTC to get moving is all you should need it for the re enable DSC. Disabling the system all together will resemble Mr. Toad's wild ride.