Ro come back to this thread, the Shuttle has several other limitations, compared to a CEV.

The Shuttle could theoretically land in Spain, Morocco, Senegal, in case of Trans-Atlantic-Landing or back to the Cape in case of Return-To-Launch-Site which means the weather needs to be good for landing in at least two of these sites.
This isn't much of an issue for capsules, anymore.
The Soyuz rocket has been launched many times under a thick fog, without problem. There is sometimes fog at the Cape too. It should be possible to launch the CEV under such a weather too.

Jim Oberg, in the BBS "Friends and Partners in Space" has raised another issue about the Shuttle: Why the weight penalty is so big for the Shuttle depending on what inclination it must be launched. All in all, the difference isn't that important for rockets than only launch a payload: whether they go due east (28 degrees) or anything up to 57 degrees, the difference isn't that much for ELVs. But the problem with the Shuttle is that it has itself a mass that won't change , no matter in what direction it's launched. So the only way to give access to space in that case is to reduce the payload mass (and here the difference is striking). It will always be more obvious to a Shuttle flight than to any other rocket.

Raoul