I appreciate your hack to use personal screen savers. I only like about 2 of amazons, and have replaced them with images that contain my contact information in case my kindle turns up missing (heaven forbid).
I have however requested Amazon that there be a way to either turn off screen savers, or have your own custom ones. My response email included:
I have sent your feedback about the screen saver in kindle to kindle team.
Personally I wish there were more customization options on the kindle, such as allowing greater use of the screen for text, and a way to edit tags on your books, but those other issues.