Cows, pigs, horses, refugees leaving a flattened town. Nice but needs bandwidth/rendering/server resources.
Not really, as most of that stuff can be done client side only. You and I don't need to see the exact same refugee running away in the exact same manner.
Things like Cows, Pigs, and sheep can be static terrain objects, so would take no more server/bandwidth resources than a standard terrain would, as to the game they are just buildings or trees. Refugees running away is also something that can be done client side, as unless they would be strafable, there'd be no reason to keep track of them from the server.