I've tried to install my IDE/ATAPI cd-writer as SCSI as following:

added lines in /etc/modules.conf:
alias scd0 sr_mod # load sr_mod upon access of scd0
pre-install sg modprobe ide-scsi # load ide-scsi before sg
pre-install sr_mod modprobe ide-scsi # load ide-scsi before sr_mod
pre-install ide-scsi modprobe ide-cd # load ide-cd before ide-scsi
options ide-cd ignore='hdd'

added lines in /etc/grub.conf:
image=/boot/vmlinuz-2.4.2-2 label=Linux read-only root=/dev/hda5 append="hdd=ide-scsi"

After a reboot I've checked it with:
$ cdrecord -scanbus

witch gives the following output:
cdrecord: No such file or directory. Cannot open '/dev/pg*'. Cannot open SCSI driver.

Notice the ' Cannot open /dev/pg*' . I think cdrecord has to use /dev/scd0 (modules.conf lines) instead of /dev/pg*
or am I wrong?

If I'm correct, how do i change this?
I use Redhat 9.

You could create a symlink from /dev/pg to /dev/scd0