Here are some of my suggestions which surpise me that haven't been said yet:
1. Armor, Armor and Armor. Such would be great because like shields it would be tedious with all sorts of tiny pieces. Great addition that was by the way.
2. A way for crates to collect ore without the player having to grab each one. Perhaps controlled by opening and closing the crates.
3. A pitch/yaw axis keybinds in order to rotate items. I think it would fit well as Q and E when using WASD to move. Since E is currently used to equip that could become F. Or all of these could just be rebindable.
4. Perhaps making it so crates don't levitate in front of your face as you carry it? Or at least making the scoll out item distance longer.