How to stop this on my Minecraft server?

I have a Minecraft 1.7.4 CraftBukkit Server, and I have Multiverse. I want to make it where have separate inventory in each world, but I can't find it in the config. I have Survival, Factions, Skyblock, and Creative and I know people will spawn stuff in on Creative and take it to them. (I also have Sg and lots of minigames but i'm not worried if they have god stuff in the Lobby. ) But I really don't want people to cheat. I also have KitPvP so I want it to be just kits, nothing from Survival. How can I make it separate in each Multiverse world?