Also:
- it's possible to browser the database via sounds-on-disk folder structure in Metabrowser Summary/Pathname/...
- You can add "Pathname" to Search Indexes (Database menu, "Modify Search Indexes" and any text in the path is included in search by default.  I do this for all my custom stuff, which can be indexed by folder name, even if I have not had time to describe the individual files in depth.  The enclosing folder hierarchy contains a lot of info... for instance a car-by from a particular film can be found almost instantly by the film's name.  (By using "project" keywords)
- Computer filesystems are very good at maintaining folder hierarchy. It's a critical function.
- If you really want to stuff "pathname" information into file metadata, go ahead.  You can use "Pathname" as a source field for field build, or export and manipulate data in Excel or Filemaker or such.  As for re-ordering the files later, I once wrote some scripts to do this for a project in which I needed to flatten a hierarchy of files and later expand them, it's doable...  A UNIX guru or someone conversant with Python or such could figure it out if it's important enough.  
-jeremiah