Feature request: Hide specific pages from authors, editors, etc

Hi!

I would like administrators to have the possibility to hide specific pages from authors, editors, etc.

If I create a page that uses some page template, I don’t want the client to touch that pages, so he could break the site easily.

This feature could be added to the wordpress core with a better user management/capabilites manager integrated. It isn’t time to wordpress adopt some good plugins to make it more powerfull ?

Thank you