Some what I consider realistic things as per Tuco's suggestion. Some overlap with Tuco
- auto sorting as you place items in your bag based on your existing sort
- click and drag the camp chest inventory to expand horizontally and not just vertically (wtf were they thinking with that one???)
- some indication of items that actually have a use in crafting, or are complete trash. (ancient forge material, that icy staff, etc)
- an indication of books that have been read, and are safe to sell
- 'sell trash' as Tuco suggested as well
Those 5 things would drastically improve my experience with inventory management.