I think they just don't want people to mess with their (proprietary) driver. The official options that are used on the final releases of their drivers are on/off by default, like TexturedVideo for certain cards, and so on. They don't want people to be using beta features and then complain that they don't work. Remember that their beta programs are closed. This isn't any different from say the Windows driver. Again, this is the proprietary, closed driver we're talking about, so I wouldn't expect anything besides the must know configuration options to be disclosed (like setting overlays and initializing the driver).
No announcement yet.
Where is the fglrx documentation?