Add any page to your site. Admin users can define a page address. Pages can be populated by an editor or by the view anypage/page/name. Pages are always relative to root.
Defined page: test_page
View: anypage/test_page
View file: views/default/anypage/test_page.php
Defined page: about/users
View: anypage/about/users
View file: views/default/anypage/about/users.php
Even works with file extensions!
Defined page: about/users/index.html
View: anypage/about/users/index.html.php
View file: views/default/anypage/about/users/index.html.php