You can choose to have MusicBee writing tags to it's library file.
I myself have it writing them to the files themselves, so I am not too dependent of that library file in case of re-installs, crashes, etc.
If you choose to use MusicBee not only as a player as you said earlier, but as a feature-rich manager, I would advice you to start experimenting on test folders and files, and see what happens, and if you are happy with that.