1) a key or button to take all the contents of a container, a la Morrowind.
2) a key or button to pick up all items from the floor. Ideally, you'd pick up just items of the types you specify in the options screen: food, alchemy plants and potions, manuscripts and books, weapons and armor, gold, magic items, crystals and runes.
3) show approximate value of items at all times, not just in shops. This makes it easier to decide what to keep and what to throw away. Sacred does this, and I love it.
Or better yet: show the ratio of the item's value to its weight. That's what you REALLY need to know to decide whether to keep hauling it around. Have never seen this idea implemented, but it would be VERY useful. <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />