Tomorrow, I successfully checked my idea with serial line. So it possible to control Kindle over Serial line. You must change root password (via ssh and usbnetwork). Reboot Kindle and enter
within 60 sec, root login and password when login prompt (in the terminal). After this you can send commands to console in example:
echo "send 193" > /proc/keypad
this will turn next page.
Left to do ATMEL (or other MCU) based adapter and write software for it