They could improve some menus, especially things related to alchemy. Searching your inventory for a potion, oil or decoction is annoying. For example, they could add two more fields to the ring-menu (where you choose sign and items). One on the left for applying oil to steel sword and one on the right for applying oil to silver sword and when you choose it, you simply get another ring menu with the specific oils (beast and human for steel and all the other stuff for silver). In addition, I would change the sorting of the inventory to: oils > potions > decoctions > bombs rather than: oils > scrolls > decoctions > potions > bombs.
When crafting alchemy, you should have the option to hide every item you already have in your inventory.
Also, when clicking on an empty potion-slot in the inventory (same for bombs), it should jump you to the potions right away, instead of just setting you to the top of your inventory.
You might also consider an option to lock an oil to a blade, so that it is refreshed after every fight until you lock another oil to it. Especially with the first oils (20 hits), clearing an dungeon of necrophages (or other types) gets uncomfortable.
Apart from some clunky menues, i am absolutely in love with this game. Brilliant job CD Project and the fact that you are still improving the game makes it even more awesome.