Well there is automatical method how to set script into every area in your module, see my
Door System at vault, there is a special letoscript distribution (Moneo by dragonsong) and letoscript script which adds scripts into all doors in your module, it should be easy to adjust it to set area's scripts, and if you would have problem with it I can help you. Or you can put it only in the areas visited by this specific player. It doesn't have to be in all of them in order to work.