I propose an alternative. I really don't want 3 queues (although my example looks a lot like 3 queues).

Add an option for "File Size Management" to the Option menu:
< > Check here to enable File Size Management
1. For files greater than "a" and less than "b" allow "x" uploads
2. For files greater than "c" and less than "d" allow "y" uploads
3. For files greater than "e" and less than "f" allow "z" uploads
(x+y+z cannot exceed max upload slots)

The uploads queue would still display in the same manner with user-selectable sorts.

The advantage is that advanced users are given the greatest control over managing their bandwidth to the shared file sizes in their library. All users will benefit from the individuals that manage these settings appropriately.

Here are two examples to clarify the above criteria:
-High-bandwidth Setting Recommendation
Max Uploads set to 34
<x> Enable File Size Management
1. For files greater than 50M and less than 999M allow 4 uploads
2. For files greater than 9M and less than 50M allow 10 uploads
3. For files greater than 0 and less than 9M allow 20 uploads

-Low-bandwidth Setting Recommendation
Max Uploads set to 6
<x> Enable File Size Management
1. For files greater than 9M and less than 999M allow 0 uploads (yep, it's a filter)
2. For files greater than 120k and less than 9M allow 1 uploads
3. For files greater than 0 and less than 120k allow 5 uploads

Note: Files greater than 9M should not be returned in search results (in the 2nd example).