Reducing turnaround times
Since each lending library can hold a request for 4 working days, sometimes files are received after a long time (for example: if there are many libraries and each one takes 4 days to Unfill, before one library eventually fills it).
A solution to this could be to treat requests with only one match differently than requests with many matches, e.g., reduce the holding time for requests to 2 days when more than 1 library holds the item.
Mira Ben Ari commented
This would also be valuable information for the lender, if they see that they have the only lendable copy, they may be less likely to unfill even if they don't have time.