Whilst I don't need the reg key, it is a little annoying as I deleted all of the Single Player missions from the pk3s a long time ago - now that I can't fix it I can't play on Pandora servers.
if you guys are worried about breaking the cds just download the crack so you dont need to use them. im play all the games i have every day and i like to keep my cds in my shelf and its prety annoying pulling them from and putting them back and getting my desk mixed with my other junk.