What I'd like to see is the ability to assign collection numbering within a box set this way:

For example, if I had the Harry Potter box set, I would have the main collection number assigned to box set and assign each movie a number or letter, either 1 through 8 or A through H.

That way, if the box set was collection #100, Sorcerer's Stone would be 100-1 or 100-A.