Ya, after you have the "iamefi" folder on your root drive:

Boot in "single user mode" ( press a key (or F8) at the "countdown" and type -s at the prompt - hit Enter )
At the prompt:
cd /iamefi
( the prompt will change and say "iamefi" in there somewhere - sorry, at work and don't remember the actual verbage )
./startupfiletool /dev/rdisk0s1 ./boot_v8 ( here you need your ACTUAL drive and partition numbers in the "rdiskXsX" !!! )
( it'll say some stuff here - 4 or 5 lines before it's complete. doesn't take long. )
reboot

Once it boots the "EFI enhanced...." goes by so quickly you don't really see it - it mostly looks like a normal boot. There's a tool refered to in one of these threads that's lets you see the EFI parameters once you're in the OS X Desktop... Look around, you'll find it.

---

Running both 10.5.8 and 10.6.4 on my stinking AMD/ATi machine...