Nope......you can use the RAID controller as a regular IDE controller. I believe the limitation refers to what you can use on the Promise controller. I've got mine set up with my HDD only on the Promise controller, and the CDROM, and CDR/W on the regular IDE controller. Works fine, but I couldn't get anything but my HDD to work properly on the RAID controller. Each component is running on it's own channel. This is on an MSI K7T Raid Limited Edition, but I set up a 6380 not long ago for a friend the same way.
-M1pilot