Not sure if this is part of the UI... but here goes.
Would it be possible to allow us to buy specified quantities of materials and items from people on the Market Board?
I think this would help promote sales because many players casually throw stacks of 99 of something on the markets when most players only need 1-5. So instead of making a sale the would be buyer looks to other options to get the item, or gives up on the item altogether.
I realize this is also partly the seller's job to determine what they think their buyer needs, it would just be awesome if we could go back to like how it was in 1.0 with being able to buy a certain amount like we did with player bazaars.