Player activated monster spawning

Greetings,

I'm in the process of making some quests and was curious if anyone knew of a plugin that might offer this functionality:

A player activates redstone (pulls a lever, steps on a pressure plate, etc.) which in turns activates a block/sign/whatever which will spawn x number of x mob in the vicinity of the player.

I know there's plenty of plugins for spawning mobs, but I'm not sure about redstone functionality. Any ideas?

Anyone interested in making one?

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

http://forums.bukkit.org/threads/ge...5-force-spawn-mobs-using-redstone-1185.23773/

Might be outdated if you wanted to spawn 1.1 mobs, and an x amount of mobs could be spawned if you came up with some sort of redstone structure.

 

That's a good start, but it's outdated and lacking quite a few features.