I don't find any doc on creating drivers. I wish to use LCDs driven by the ks0066 controller. This controller isn't so rare, it's the one mounted on RS LCDs.
I have modules from Maplin that use the KS0066 controller, and they are compatible with the standard HD44780 commands. You should be able to use them in exactly the same circuits with the same commands. The character map may be different, depending on which version of the chip you have.