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Well, I've been thinking, and here's what I've come up with. You Rip the game onto your PC's HardDrive, and edit the files inside (Which we already know to contain online gamedata, e.g care packeage probabilities), and copy them to a disk. We then insert MW2 normally, and start up a Single Player mission. Whilst on a SP mission you remove the disk and no prompt comes up. You then insert the hacked disk and play online!
Just a thought I'd let you guys play around with. If this is completely useless I apologize, I'm just trying to help