They may only be on your car for a few months and offer a huge driving advantage, but winter wheels and tires are susceptible to irregular wear and tear—actually, more susceptible than other tires because of aggressive tread designs. As a result, you'll want to assure proper alignment before installation and, of course, throughout their use to get the most out of them.
Caster, camber and toe tweaks typically come into play when adjusting alignment, but you'll want to be most aware of the camber and toe settings. Caster settings don't typically affect tire wear.
Camber: The vertical tilt of your tires. You'll always, in every situation, want to use the vehicle manufacturer's preferred settings when installing your winter / snow tires. Too much tilt one way or the other will cause irregular wear on the tread because you'll be driving on them unevenly.
Toe: Whether or not the tires on both ends of one axle are aligned to drive toward or away from each other. The toe settings compensate for suspension movement, and proper settings are also the vehicle manufacturer's preferred settings.
Aside from suspension, you'll also want to keep tabs on your winter / snow tires' pressure. Remember, air fluctuates when the temperature fluctuates—that means your pressure can change just by moving your car out of the garage. Check your pressure often throughout the winter months to assure that it meets all established guidelines.
Read more about air pressure.