Simple plugin enforces flight rules based on user permissions.
wingedsandals.allow.WORLDNAME -- Allows a player to fly, as if in creative mode
wingedsandals.force.WORLDNAME -- Forces a player to always be in flight mode
wingedsandals.override.WORLDNAME -- Keeps the plugin from affecting the player on the given world. Useful for ops/mods, or when you have a world or two you DONT want this plugin to change the mechanics of.