Would be great to be able to capture a trading Thrall and use as vendor within a shop a player builds and allow trading with other players both while online and loged offline on multiplayer servers.
Craft armor / weapons / tools and load them onto the trader thrall and set the payment and quantity you want for each item.
Iron bar = 15 iron ore
Chest armor = 100 stone
Foot armor = 25 wood
Depending on the type and tier the player would adjust what they will take in exchange for the item depending on what they need.
I think this would add player driven content and add alot to the multiplayer aspect of the game.