So, I found some issues with this build.prop. I use a wired headset with a button on it that pauses/plays my music. It works fine with Slacker when I'm on the default build.prop, but when I'm on the thunderbolt one it sometimes doesn't work at all and when it does it pauses Slacker and then pushes play on the default music player.
Another issue I have is that I skip and rewind by holding down the volume keys when the screen is locked. Works fine on stock, doesn't work fine on the thunderbolt build prop.
How I found this out is that yesterday, all day, all of this worked fine. Then early this morning I did the thunderbolt build prop and suddenly it all failed. Then I came home just now and put it back to stock and now everything works again.
Info potentially important: I'm running the latest 11/06 tickerguy CM7 rom and also for my lock screen I use the latest Widgetlocker. I don't know if that last bit is useful, but it does have settings to enable to skip/rewind feature.