A few visual ideas

[Troll2k]

I have used sea gulls,sheep and cows in a multiplayer map.Others that have joined have seen them also.However although they show in hosted game they do not show in a dedicated server game.

Unfortunately they are like the trees and runway signs.You can fly/drive right through them.

In the old 1946 parts flying off a plane in front of you would cause damage if they hit you.I am not sure about Clod.Parts fly off but I have not been hit with them yet.