Batch selection would make it sooooo much easier to manage.
Not to mention, the interface for the inventory and vendors isn't nearly as precise or reactive as it should be. Double click for selling for example is really annoying and not always works (in DOS2, you click once and the item goes immediately on the trade 'column' or whatever you want to call it.)
Dragging items from one character's inventory to another sometimes also results in the item not moving at all or not ending up in the slot I want place it in. Some items are also bugged and can't be picked up from corpses (some armor pieces that can be looted from the enemies outside of the crypt come to mind) and you have to send them to someone else's inventory by right-clicking on the item while looting the corpse.
In general, the inventory system needs some polish.
