Oh, I found a big bug. Sort of. I use GriefPrevention so players can't open each others chests without permission, but if I do /fancyshop create on a chest I normally couldn't open then look in the shop's inventory I can steal everything a player has, then just remove the shop and they won't know who stole their goods. When you create a shop the player should be able to open the shop first before it is counted as a successful shop build, or better yet, you should add a sign method of making the shops. So if a player can build onto the chest it will count as a successfully created shop. But the sign could be later deleted for it to count as a successful shop. It's just upon first creation of a shop that would be the issue. Another way to make stealing players chests not possible would be to have a recently placed chest rule. So the player would have had to recently place a chest in order for shop creation to be possible.

I think this is a dupe of #12 , not sure why I created that one when this exists. Should be fixed in 0.4 though.