Upload or download
of music can be made available for individual users
. Just select who can (and who cannot) upload and/or download. Read more
What's "Display ID numbers" ?
When enabled (checked), this personal setting adds an extra column called "ID" everywhere tracks are displayed in AmpJuke. The column displays a given tracks corresponding ID-number from the database.
Although displaying an ID-number might seem like a waste of screen real estate to ordinary users, displaying ID-numbers gives users with administrator access an option to edit the track/performer/album by clicking on the ID-number.
See this FAQ-entry for more details about editing: How to edit stuff.