There's a module for it, ide-scsi.o, I've never seen it done with hard drives before, its usually the trick to get ide burners to work.
You can try it, create in lilo.conf an identical entry for your kernel, name it Testing or something, and under label make another line:
Make certain that the drive your running scsi emulation on is NOT in /etc/fstab, or that its noauto, or you'll get a kernel panic as its new info will probably be /dev/sda1. Regardless, check dmesg when your done to figure out what the new drive ID is...
I'm pretty certain this WILL NOT WORK with the boot drive.