type:"/tradelocker" to invoke items interface, add items then close.
You can shift+click items in AH, bags,inventory,chat ,atlasloot , etc..
it's no necessary that you own the item, you need the ITEM LINK
Once you start trading , check the checkbox to activate addon
Select desired item from list matching each slot and type quantity.
you can click on trade safely.
Tested on icecrown only.
You will need 7z to extract archive, put TradeLocker inside your addon folder.