can I add an obnoixous feature request?

Any way to make the backlight dim to a preset level based on time of day? (one level for daylight hours, one for night). I've been using the 800 in the car lately as my mp3 player, and usually I have it set to full brightness during the day or else I can't see the screen, but at night I have to turn it almost all the way down so that it isn't blinding. kind of like the light sensor functionality, but without having the light sensor..