I don't think there is any solution given in the forum at the moment regarding this, except maybe
https://www.mobileread.com/forums/sho...d.php?t=207020
which I had viewed a few months back, but in my mind, it seemed like it would be a battery drain due to "What it does is constantly write whitespace to that area. Unfortunately it does this all the time, not just while you a reading a book."
Anyway, I think one more solution that can exist is for me to install a custom reader, and use that instead.
Or, possible, upgrade my kindle 3 keyboard to a newer kindle, but, I don't know, I'm just so attached to my K3, that I would feel uncomfortable holding a newer device.