I've used the soccer balls in one of my maps. They are easy to add in. Just pick the entity tool, then passtime_soccer_ball. From what I can remember they can be team specific for the skin but not when shot. But that is for a normal map. If you have a passtime map with passtime logic added then they can be team specific.
It has been a bit but since I messed with these so my info might be a little off but very close.
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