Using RH6.0, latest boot images, kickstart will work until it tries to install lilo to the mbr. I had an existing dos partition defined. When it gets to the lilo installation point, I get an error that the boot loader could not be installed. Being the inquisitive type, I manually removed the dos section from /mnt/etc/lilo.conf and ran /mnt/sbin/lilo -r /mnt, and then lilo installed. When I went back to the error screen in the installer and told it to retry, it failed again. So, I went back to the shell prompt and cat'ed the /mnt/etc/lilo.conf and it mysteriously had the dos section again. Having the lilo portion of kickstart being configurable to only deal with the linux partitions would be a plus. I can go back an run lilo again after the machine is up. As it is, this bug is a kickstart stopper.
Issue is resolved in the latest installer.