Thanks for educating me on the importance of documentation. If you could also instruct me about **how** it should be improved, not just **why**, that would be a "giant leap for the mankind".
As I said below, why not mention the overlays in the administrator guide, add some real life examples (lots of them available from the mailing list questions). The man pages are good for quick reference but not for installation (specially for new admins.).
Like I said, all in the 2.4 Guide, just not quite complete.