jojoee

By default wordpress menu system, wordpress can only automatically add/remove top-level page to/from menus
<ul>
<li>When publish top-level page then add it into menus</li>
<li>When move top-level page to trash then remove it from menus</li>
<li>When restore top-level page then add it into menus</li>
</ul>
this feature has no effect with subpage (child page), but Auto Subpage Menu can
<ul>
<li>When publish subpage (child page) then add it into menus (if its page parent exists in menu)</li>
<li>When update subpage (child page) then update menus</li>
<li>When move subpage (child page) to trash then remove it from menus</li>
<li>When restore subpage (child page) then add it into menus</li>
</ul>
<h3>Notes</h3>
<ul>
<li><a href="https://codex.wordpress.org/WordPress_Coding_Standards" rel="nofollow ugc">WordPress Coding Standards</a></li>
<li><a href="http://www.phpdoc.org/" rel="nofollow ugc">phpDocumentor</a> DocBlock Standard</li>
<li><a href="https://wordpress.org/plugins/auto-subpage-menu/" rel="ugc">Auto Subpage Menu</a> – WordPress Directory Uri</li>
<li>2 spaces for indent</li>
<li><a href="https://github.com/jojoee/auto-subpage-menu" rel="nofollow ugc">Repository on Github</a></li>
</ul>
<h3>TODO</h3>
<ul>
<li>[ ] Implement DocBlock to all</li>
<li>[ ] Automatically update child-page when its parent have been move, suggested by <a href="https://wordpress.org/support/profile/ncwebdev" rel="ugc">ncwebdev</a>, <a href="https://wordpress.org/support/topic/menu-link-doesnt-work-properly-when-moving-a-page" rel="ugc">topic</a></li>
<li>[ ] Add other versions into wordpress download page</li>
</ul>

Auto Subpage Menu

The idea is good but the support is not very good. So if you find another plug-in with similar functionality I would advise to try that!

Good idea but bad support

By default wordpress menu system, wordpress can only automatically add/remove top-level page to/from menus

Julio Potier

You can now add passwords as many as you need on every protected page.
Why? Because you can protect page and give your client a personnal password, not just a random pasword or everyone.
Option: If you are logged as admin or the page’s author, you won’t need to enter password.
Option: If you set a list of child pages, just change any password (parent page or any child) and all the password for the hierarchy will be updated!

Multiple Passwords for Protected Pages

Add more than 1 password to your protected pages, also administrators and page's authors can view the protected pages without password.

Auto Subpage Menu vs Multiple Passwords for Protected Pages