You can manage the categories permissions throught Administration Control Panel in order to hide it from unregistered users. Maybe theres some more options there.
What's your idea for inplace editing for the 'title?
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Quora allows people to edit title of their topics separately in the place that the title appears.
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Sounds like something that should be part of a theme to me.
If you wanted to make such a theme, in-place editing isn't really difficult, you're just swapping visibility between a text block and a text input. Client-side you would only do the swap for the correct user(s), and then server-side verify and actually change the topic title.
