Here is a feature I would really like to see. One thing that really bothers me with inventory is were stuff goes when moved, and what happenes when moved. For example I have noticed that some folders you move to inside another folder stays in a folder while others you move simply dump their contents into the new folder and that folder then disappears, and I have found no way to see witch of those 2 it will do when moved.
I also find it very clunky when you open a box and need to move it back into inventory because you then have to make a new folder for it to go. Also this is another big issue, when you are doing something big like say moving to a new house, it is really easy to make a big mess out of your inventory running around picking stuff up.
So this is what I would like to see is a option when you right click a folder, to make that folder the active folder and this does 2 things, (1), If this folder is moved to another location, even if inside another folder it reamains a folder and keeps its contents. (2) When the folder is selected as the active folder, all new items received, picked up or purchased will then go inside this folder. This would make it much easier to keep things where you want in your inventory