[CentOS] How to prevent installer using disk labels?

Is there any way, when installing CentOS (or any RH-based distro),
to prevent it from using disk labels in /etc/fstab and /boot/grub/grub.conf,
and to force it to just use the actual device names?

For testing purposes, I am installing two different CentOS versions in
different partitions, and am having to change from labels to device names
by hand, and re-label the disks, in order to avoid the boot process getting
confused between the filesystems.

Cheers
Tony
-- 
Tony Mountifield
Work: tony at softins.co.uk - http://www.softins.co.uk
Play: tony at mountifield.org - http://tony.mountifield.org