This is what I did to disable my DRL's and it works flawlessly. DRL's do not come on, auto lights work as advertised...I think my car looks prettier with just the amber parks lit up. I have an '03 tho, so I can't speak to the earlier models that have the DRL's reversed. I also did the same thing for my GF's G6, and my buddies crappy Saturn with no issues.
http://www.aleromod.com/forums/showthread.php?t=27855