For any item to be interacted with, it should be set to dynamic, and I suppose with some work a cannon could be made so that a ball appears at the end and goes forward, I'm having trouble with this effect myself, but I believe this sort of thing has been done before. As for multiplayer scripting to get capture the flag? I believe I read somewhere that the Lemur IV mod might get scriptable multiplayer modes, try checking it's thread under fpsc chat.
I love Jenkins forever :p
There is nothing to fear except fear itself... and FPSC bugs.
