It would be neat with a "/ppw set [password]" to set your password, and then the you need to use "/ppw [password]" to be able to do anything - for short: in-game player password. I dont think there's much more to say about it, but that I hope someone might find time to make it
thats been made a few times, this one should still work i think, http://forums.bukkit.org/threads/se...ssword-protection-for-your-server-1000.27868/