I was reading this post, and got to thinking.
If something like the ability to implement snow was ever added, why not add something such as selecting the temperature. With the wonderful advent of clothing added, the possibility of shivering could be added if you are too cold, meaning you'd need to wear heavier clothing such as jackets and etc. Of course, shivering directly translates to affecting your aim.
Clothing, and more specifically maneuverability with bulkier winter clothing has never been taken into account, and it's something worth taking a look at.