Great work @Josharias , and +1 for tabsWhat do you think about a two-fold editor with (1) for general selection and (2) for detailed specification of the block/item.(1) can be categorized (e.g. using tabs) into some sub-panels, maybeare all types of blocks that can be retrieved in any shape (e.g. grass, stone, ...),are only available as-they-are (e.g. the quern from WaS), and thesection is self explanatory.(2) can be used for further specification of the block/item. For instance, free-form blocks' shape can be adjusted, a fixed-form chest block can be filled with blocks and items, and item properties can be adjusted. (Not sure how much customization is needed in general, but for block shapes this seems to be a good solution). By default this section could be hidden/folded.A textual search box is useful to find some specific block/item. With the Block Picker open, typing some key could immediately start the search (I think it would be nice if the whole Block Picker could be used without mouse). Similarly a field for the amount of blocks the player will retrieve can be added to the interface (again, typing any number can trigger the amount box to be overwritten).