[Cross]

Keep in mind that SPWW2 typically simulates a battle that lasts only about an hour.

I recently finished a battle in the snow. The men and vehicles trudged at about half the speed they normally do in summer. I had to completely change my strategy and tactics; roads became really important, I had to be careful not to drive my vehicles into snow drifts, and it was harder for infantry to get armoured support.

I think visibility is modelled in the game quite well.

But what is it that you'd like to see in the game that it doesn't have?

As for water, I know there's shallow and deep water. Stay away from the deep unless in a boat ;-)
I just had a tank get stuck in a river while crossing at a ford. Doesn't happen often, but moving fast over fords, rough ground, mud can cause breakdowns etc.
You can adjust maps to put the tide anywhere you like.