I wouldn't bother I ran 10.5.1 with efi and can't remember having this issue.
Though i must admit I ran tiger without efi and its the stablest thing I've ever used. Just used to piss me off cos reboot wouldn't work and there seems to be no chance of updating it to 10.4.11 everyone whos doing anything is doing it with leopard.

I must say though for all the shit we've been having we're running something on hardware it wasn't meant to be run on and its still better than vista. Always good to keep perspective.

I don't think my system is cured. No crashes but that roughness of the mouse movement is back and I've only been online one and a half hours. Boll*cks