I was in the store and pressed 2 to try to drop some of my pickaxes for selling. But I hadn't filtered to only the pickaxes beforehand.
Now I have to go through 50 or so dialogs to tell the inventory system that I want to drop 0 of every stack. A way to cancel the drop action at this stage would be nice.

More generally, any multiple drop in a store triggers a long sequence of dialogs that the player should be able to abort.

Even more generally, the sequence of commands needed to pick up or drop only some of a single stack in your inventory is unintuitive.