About the keyboard layout: Most tips result in changing the /system/usr/keyboard-config/keyprint.xml. But this only changes the layout for the standard input method. To get it working, I realized when flashing the last time, that you can change the /system/usr/keylayout/mimmi_keypad.kl or .../qwerty.kl. I changed both, to see what happens. Now that I know, that it works, I will only change one of them prior to next flashing to see, which of the is the desired one... My guess is the mimmi_keypad.kl.
However, ALT-Z stays ALT-Z. This means, that the number 3 will be not at the usual position.