modifying cramfs?

I've just fixed the dtd files so that I can get autoyast to recognize all my options just fine, but now the problem is how to get the source updated. If I understand this correctly, the /usr filesystem used during installation is a mount of the "root" file, which seems to be cramfs. AFAIK, cramfs has to be recreated since it's a RO fs, but how can I do this? Another problem I've run into btw. :) I've configured only one nic in the xml file, eth0, although this is a dualnic box. Problem is that the config file is named ifcfg-eth-id:<mac addr> and the nic is actually using dhcp after the first boot. If I rename the file to ifcfg-eth0 and restart network, everything works as expected. Any suggestions? Regards, Harald