I am using WP as CMS for several sites. I always use custom menus as direct navigation to all pages is not needed. The problem is that I end up with potentially hundreds of pages displayed in the pages admin of WP.
Feature Request: Include a simple page grouping option in the WP Pages admin for easy viewing and easy search/find. Something as simple a color coding would be a good first step. But, ultimately having a way to drag and drop pages within specific groups would be immensely helpful.