For things that can be bought, it'd be neat if I could start a list of items I need for various crafting.
User Story looks like: I'm looking at the recipe for Green Eggs, and I have 7 eggs, 0 spinach - I set the recipe to make 12. The UI shows that I'm short 5 eggs and 12 spinach. I click on "spinach". The info pane informs me that spinach can be bought from a produce vendor. I click on the "+ to list" button, and my To Do list gets "Spinach: 12" added in the Produce Vendor section. I click "back to recipe," and click eggs: "you can harvest eggs from egg trees" - "+ to list" adds "Pick 7 eggs" to the general section of To Do.