Some basic questions?

Some basic questions?

Greetings!
  1. Is it possible to manage navigation? (i.e. Can a user control showing or hiding pages in the navigation bar. At present every page added to site is appearing in navigation bar. This may not be useful for bulky sites having many pages.)
  2. Is it possible to have Page > Sub Page > Sub Sub Page > Sub Sub Page?
  3. In a published site, is it possible to lock certain pages from viewers? (i.e. Can there be password protected pages?)
  4. Do you plan to introduce site locking? (i.e. Certain section of site can be made available only to the authenticated user & not to others?)
  5. Besides embedding, do you plan to integrate Zoho Challenge with Sites? If yes, what are the things in your roadmap?
  6. Isn't there any undo redo facility?
  7. How to use Anchor element?
  8. How to introduce Table of Contents?
Regards