SL6 uses dracut for its initramfs. RH claims that dracut is much more capable and maintainable than the previous system. One feature of dracut is that it probes for devices (eg SCSI controllers) at boot time rather than relying on configuration derived from /etc/modprobe.conf. This means that it should no longer be necessary to include options headers for SCSI controllers in LCFG profiles – a common cause of confusion! However, it’s not yet clear to me how you can pass flags to kernel modules loaded by dracut – this will need some investigation.