Thanks all.
Quote: "With the prefab, how do you create a new prefab?"
Yeah, that would be nice, but not without modding the source. I think you could make entity zones that are invisible in game which you could provide scripts with to accomplish what you want. It's not a bad idea to have a pack of pre-scripted entity zones that you could just place down for certain effects. It wouldn't be anything that couldn't be done with a trigger zone and a little scripting, but it's certainly in keeping with the ease-of-use aspect of FPS Creator.
If you want to work on the effects, I could try to make some markers.
Brian.