Uh, you know that all you have to do is modify the actual containers to get your desired effect, right? You don't really need a script. :p

Edit: By the way, I'm not exactly sure if you can modify things like that yet. No wait... Well, there's a ZScript function called Link->MP. Perhaps you can use that to get what you want. Just declare a variable (using int or float) and tell it to load that. It SHOULD work, but I'm not guaranteeing anything.