Bukkit

What is the enhancement in mind? How should it look and feel?

I would like to be able to link a single sign to multiple chests.

Please provide any additional information below.

You already have most of the code for making a sign draw off of multiple inventories with DoubleChestInventory, it would just need to be refactored to support any number of sub-inventories, instead of just two. Additional changes would also be required to store multiple shop links to different chests, and modifications to the /duckshop command to link multiple chests.

Perhaps add a /duckshop unlink command which can clear all links to the next interacted chest or sign, and then just have /duckshop link add new links each time instead of replacing old links if they exist?

That sounds doable, but it's low priority now. The code's pretty hackable so if you'd like to implement it, then feel free.