My "WebOptions" idea would permit the user to customize these and other settings (both globally and locally; there could be some set of "common" keys as well as

My "WebOptions" idea would permit the user to customize these and other settings (both globally and locally; there could be some set of "common" keys as well as supporting keys specific for the server), in a similar format to cookies, although the server and document scripts would not be allowed to set them, and the user only sets them explicitly. For email, there is a "From" header, so that can be used if it is available. But anyways, the service should not make it difficult to download if it detects a wrong computer; it should allow it always, and should not be so difficult by trying to hide it.