You can manage the categories permissions throught Administration Control Panel in order to hide it from unregistered users. Maybe theres some more options there.
Server control panels
I'm currently looking into different server control panels. I have previously used cPanel and Virtualmin but now I am configuring everything manually through command line.
What control panels are everyone using? or are you people the down and dirty command line type of people?
Which would you recommend?
$ bash ftw