Bukkit

QuickShop version 4.2. This server is running CraftBukkit version git-Bukkit-1.5.1-R0.1-21-g49b0699-b2754jnks (MC: 1.5.1) (Implementing API version 1.5.1-R0.2).

I can add items to the chest which the shop doesn't sell. When the correct items are sold out "/qs clean" will open the lock of my shop and everyone could take my stuff. It would be nice if you cannot add items to chest that the shop is not selling. Or at least a warning when you insert wrong items. Also if you are selling one type of item in several conditions/enchantments, it would be nice that when the shop sold out one kind, it would start selling the other types (update the details automatically).

Config:

#Tax amount (decimal) - Eg, P1 buys $50 worth of stuff from P2.  Therefore, P1 loses $50, P2 gains $(1-0.05)*50, and tax-account gains $(0.05)*50.
tax: 0.05
#The fake player who money from taxing people goes to
tax-account: tax34798

#Should we log transactions/creations to Bukkit\Plugins\QuickShop\qs.log?
log-actions: true

#Advanced.  This chooses which economy to hook into.  If it fails, it will fall back to trying vault. Spelling must be exact. Case insensitive.
# Vault - Will hook into anything vault can hook into (Vault is required for this to work)
# Satoshis
# Want yours added? Contact me (Netherfoam) on dev.bukkit.org
economy: Vault

database:
    mysql: false
    host: localhost
    port: 3306
    database: quickshop
    user: root
    password: passwd

shop:
    #Cost to make a stall
    cost: 1
    #Should we refund when their shops are deleted/removed/broken?
    refund: false

    #Is there a fee for changing prices on a shop (Help deter endless undercutting)
    price-change-requires-fee: true
    #If price changes require a fee, how much is the fee
    fee-for-price-change: 1

    #Should we try and lock their shops from other players, so people can't steal from them?
    lock: true
    #Should we require players be sneaking to create and use shops?
    sneak-only: false
    #Should we automatically create the sign for the chest?
    auto-sign: true
    #If a player owns an unlimited shop, should they receive the cash from it or not?
    #If you buy from YOUR unlimited shop, you will NEVER be charged $$, regardless of this setting
    pay-unlimited-shop-owners: false
    #Should we place display items on the chests?
    display-items: true
    #Should we place item frames on chests?
    frame-items: true
    #When someone uses /qs find <item>, how far should we search in blocks?
    #This command lets users shop quickly without wasting time searching
    #Settings > 100 WILL cause lag. Don't do it, or don't cry when your server lags.
    find-distance: 45

#List of items to disallow selling of.  Anyone with quickshop.bypass.<itemID> can bypass it
blacklist:
    - 0 #Air
    - 7 #Bedrock
    - 19 #Sponge
    - 51 #Fire
    - 52 #Monster spawner
    - 90 #Nether Portal
    - 119 #End Portal
    - 120 #End Portal Frame
    - 383 #Spawn Egg