Unless you isolate the 'sinking' effect of the snow into isolated areas, snow banks. Basically I mean tiny little 'ponds' of this quasi snow/water. So basically theres normal 'snowy' ground in most places. But in many places, flat places, there are the snow banks of different depth. In the ones in areas veichles will most likely be moving they can be shallow so the viechle's won't have any problems. In other areas the snow banks might be deeper, forcing infantry that take a wrong step into a deep bank to do that 'swim/hopple' thing I mentioned before to get out, leaving them vunnerable to attack. ANd if the map makers place these snow banks in the right areas, it will affect gameplay alot, giving the rebels advantages in areas like the trenches, where they might be able to fire down into the snow hopplin stormies, and advantages to the imps in others.

Futurama: You Can't Prove it Won't Happen

I think the snow idea wont work ^^

you can make it in BF2 and BF1942 so things wont get damaged in water.