Well, I keep dropping mobile data with play music when the screen is off... but not other apps. Play Store for instance, will continue to download apps with the screen off.
I made a nandy, restored an old one (some version of AOKP and Axi0m Morphr), and play music streams with the screen off. Restored my current backup, and back to no music streaming with screen off.
I don't remember what build of AOKP my Morphr backup is of. I'm hoping it's a recent one so I can still use nav bar widgets. Long press back button to toggle weather FTW!
Maybe I'll just dirty flash b38 again, and see if that fixes it. Going to a party Saturday, and I already made a playlist... streaming with the screen off is almost essential this weekend, lol
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