I followed the directions at http://feature-enable.blogspot.com/ , and it worked out perfectly. You basically put a modified copy of grub in a certain directory structure on a USB key and reboot your laptop. The laptop's EFI firmware (normally hidden by a BIOS emulator) sees the modified grub and loads it instead of the BIOS. Then you get to poke some flash values, and reboot. It's a little scary, but I haven't heard of anybody breaking their laptops from it. It worked for me.
