Instead of copying over the entire world folder, you can also simply load the stock map in your .lua and save tonnes of memory. Look at the stock script that you're wanting to edit and copy the lines that specify which world files it's loading and copy those over to your own .lua.
Since it seems you're more going for a side mod, you should read the FAQ topic:
http://www.gametoast.com/forums/viewtop ... 96#p287596
instead of this one. Good luck
