To open the Print Library to anything a user enters is to invite unproductive mayhem. However, in the incomplete bibliography project, FL set up some structure for the books referred to in FL resources. Please allow the user to enter items in this master "bibliography" into their print library. They cannot be searched but knowing one can check a reference from one's print library would be very valuable - especially if its presence was marked by an icon as the locked resources are.
Oops I left out vote at Expand print library to include references outside Logos | Faithlife