Thanks guys for all the help.
Firstly, I was able to get OPL onto my memory card. Like Grimlock mentioned just go into the FMB Configuration and there's a settings called ODYS(or something along that line), and you can set up a newly installed .elf through that. Just thought I'd put this incase somebody else stumbles across this thread with the same question.
And for the Odin Sphere, I got the game working by burning to 4x. For some reason ESR wouldn't recognize the disc at 8x like Dashey recommended, but 4x was the charm. And what I read was right, there is no lag in the PAL version of this game. How freakin' awesome! I'm wondering if the devs released the PAL/JAP version of this game after the NTSC version and thought they needed to fix the lag.
And finally to Qman, thank you for that info. I have a Slim ps2, and believe the model is a 7001, or 7002. I forget which.
But anyways, if the PAL version of Odin Sphere runs on my NTSC console with having to use the app that you linked me to won't other PAL games as well? Nevertheless, if I run into a PAL game that won't run then I'll try the app. The only thing is I'm a Linux user, so hopefully that Yfix runs under it with Wine. I got lucky with the ESR patcher working under Wine so hopefully this does too.
Anyways, thanks to all of you for helping me out.
EDIT: Ugh... Just what I feared. Yfix isn't working under Wine. Maybe I'll come across a PAL to NTSC fixer that will work in Linux...