Update videos without losing URL, view counts, comments and ratings

Replacing existing videos would be a nice feature. The version of a video I have up on YouTube has a name missing from the credits. I have added that name to the credits on my end, but I don't see a way to *replace* the old version of the video with the new version. I would prefer not to delete the old version because, not only will I lose all comments, ratings and view counts, but I will also lose the URL that is already linked to from elsewhere.