[sciurius]

I think being able to transfer using msf files is fine. If I want to physically share songs between databases I can import them from the same disk files while managing the files myself (yes, caveat emptor).

As for the settings-only database: it is good to be rather safe than sorry. With separate databases, it will be possible to create a single-song database to show and exchange a particular MSPro problem.

Copying settings from one database to another may be something to consider. However, to protect the innocent and unknowing user this would require a new backup type, one that doesn't clear the existing library upon restore.