First, I would like to salute the Primefaces team for delivering the best opensource JSF components. Your efforts are really commendable.
On the other hand, I just note that there is one significant component that is missing from your arsenal, and that is a command navigation component. This component is just simple. It behaves like a button or link that lets you navigate to other pages and at the same time it looks like a tab. In Oracle ADF Faces it is called "commandNavigationItem".
Below are some sites that uses sort of tab as the navigation.