install from not-the-first cdrom possible with kickstart?

[Gianluca Cecchi]

I'm trying to install f8 (and tried with rh el 5 too) on a dell 1950.
I'm using virtual floppy (for kickstart file) and virtual cd (for dvd iso
image), that are emulated as scsi over usb.
Onboard there is also a physical cd (seen as hda).
Virtual cd is seen initially as /dev/sr0 and then mapped by udev to
/dev/scd0.
Virtual floppy is seen as /dev/sdb

I'm able to boot from virtual cd and at boot prompt I can type:

linux ks=hd:sdb/ks.cfg

so that my automated installation starts correctly using the kickstart file,
where I have the lines:

install
cdrom

During installation phase I get an error about not founding cdrom device.
At this point I can choose "back" in the screen and the installation
proceeds automatically using the virtual cd.
Is there a way to tell ks (or in command line) to use automatically the
virtual cd instead of the physical one?
I noticed that in ks docs there is:
cdrom — Install from the first CD-ROM drive on the system.

Is it the "first" word above causing me the problem?
I would like to have a completely unattanded installation path.... without
necessarily pass through nfs or other network based installations?
I found suggestions about using idex=cdom at boot prompt and tried without
success:

linux ks=hd:sdb/ks.cfg sr0=cdrom

linux ks=hd:sdb/ks.cfg scd0=cdrom

Thanks,
Gianluca
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