Since this is a make better discussion I got few ideas if I can say them.
I haven't played the game for too long so some of this might be in game already.
- Making armor (new icon in anvil)
- A leather crafting station (for leather straps, leather armor and stuff)
- You are basically selling dull blades so a new sharpening stone (and well next to it because you need to pour water on the stone or cool of a blade)
- And since we are talking about wells make it so the water will slowly evaporate from the heat. Then you need to refill a bucket.
- Building your own shop (or customizing it - decorations and making the place bigger)
I got more ideas but I let you guys think about these first.
P.S. - Great game.