@AndyT I have edited the description based on your last comment. Is it still ok?
There are two things that would be useful to clarify:
What do you mean by “a central library”? How can the DAW know that a file is in a special place? All they see are folders and files (I think). At most, Bitwig could probably detect files from installed Bitwig sound packages.
And the “harder” option looks very harder indeed. If a user renames a file used somewhere else, Bitwig will tell them that a file is missing when they open the project. The user can fix the problem by adding the right file to the project. I really doubt a dev team would want to go trhough the work of building some kind of database to track changes in local files across all projects.
If we don’t know for sure, I’d rather leave this blank.