Have you had time to check PowerTools Lite's Beta2 under your x64 system? I tested the Beta2 in my 64 bit test environment and as far as I could tell, the Beta2 is perfectly compatible with 64 OS.
You can check it out here: http://www.macecraft.com/phpBB3/viewtopic.php?f=10&t=3774 (please also post your comments there)