I actually really like that idea. SUPPORT.
Just to clarify the problem, though, adding more sorters won't simply fix the problem. Let's say I have 3 macerators, and I set the filter for all of them to be Iron ore, copper ore, etc. This will cause the ore to be put into the first available machine. This creates for a very efficient distribution system. However, if 3 isn't enough, then adding another sorting machine won't help this distribution unless the side that leads to this sorting machine is guaranteed to be last. However, I just thought of another feature that would fix this problem:
4) ability to order which sides are sorted first. If I could set this priority, then I could come up with a distribution system by chaining sorting machines.