- make it more obvious when a character cannot use an item (or a scroll) directly in the inventory (so one can see immediately which items do not fit this character). It could be a greyed-out icon.
- make items which are not usable at all (not a weapon/armor/magic item/quest item/... only good to sell) more obvious in the inventory, perhaps adding gold pieces indicator on them...
- make items like books / notes with content to read more obvious, and ensure they differ from books / notes one cannot read (which exist in the game for some obscure reason)
- add filters to inventory so one can show only one type of items (ingredients / weapons / armors / etc...)
- in loot dialogs, please stack items of the same type (money, arrows, etc...)
- never automatically equip a new item on a character (this is still the case)