A tiny quality of life upgrade if it's easy enough to code - Allow players to purchase potions in stacks larger than 100 to make buying 2k pots less annoying
From Update 70: Increased the number of potions that can be purchased in bulk, up to 1000 at a time (previously: 1 stack at a time). And from Update 71.1: You can now purchase the maximum capacity at once for bundles that stack over 1000 in one item slot; for example 2000 arrows.