I've got a patch for this. Turns out something I wrote months ago will work. I basically removed the dialog box that prompts for the CD.
The Story:
I got tired of having the OP2 CD in my drive (which was there for months) and reving up the drive everytime I opened explorer which froze the computer for a few seconds. Also, I wanted to put the second battery back into my laptop. I also didn't much want to run the no-cd crack since I already had a CD and because I didn't much trust running exe's from off the net (I was still new here). Anyways, I ended up writing my own no-cd patch. I just got off my lazy behind and booted up the laptop (which still had my patch on the exe) and tested it out. It works. You can either use the music from off the CD or copy it to the hard drive, or just plain play without music or a CD. It only uses it if it's there.
Anyways, I didn't really want to release it since I didn't really want to be responsible for people pirating the game. Besides, people don't really need two patches out. But, since all the updates are coming out for the cracked version, thus forcing people to use that copy for multiplayer, I figured it shouldn't ruin music for people who actually own a CD. I'll speak to Hacker about changing the no-cd part in the next update.