Maintaining Administrator control over the database

You may ask "Several people use the church copy of Worship LIVE, but I'd really prefer that only I could add or delete songs."
Easy enough - set a Song Editing Password in the Unlock preferences. This is not really secure, since anyone can delete the password, but it is a strong indication that you want some control over the database. Remember, anyone can edit or delete the song files stored on disk without using Worship LIVE, so this password is merely a deterrent.