I suggest the ability to set market prices. My idea would be we'll have 3 slots where we can put any price we want and then once we sell something in the dealer, we can opt to choose among those 3 slots or ofc the traditional typing the price.
This seems like a simple thing but it helps a lot when selling items in the market especially items like repair scroll 1 by 1. Instead of entering the price everytime, we can just choose among our custom options thus shortening the process.