This plugin came about after playing several adventure maps with friends on SMP and watching several LPs doing the same thing. I was always rather disappointed that you were stuck on one difficulty throughout the entire map. It is an inconvenience to shutdown the server, change the difficulty, are restart the server each time the map told you to change the difficulty.
Initially I wrote this so you can change the difficulty of the current world on the fly. But I thought, why not let you have different difficulties on different worlds. If you want a survival creative map, you can set it on peaceful and not have to worry about monsters and your hunger bar. If you want a pure survival map, you can set that map to Hard and your creative world will still remain on peaceful.
Use THIS or CURRENT for the world name if you want to set/view the difficulty of the world you are in
Uses bukkit's internal permissions. I will not support other permission schemes.