Issues accessing usb diagnostic mode in Lollipop/cm12/pa topic

Ok, after searching quite a bit, there doesn't seem to be any way of configuring usb diagnostic mode (sys.usb.config diag,adb) in CM12/PA 5.0.2. I've tried several times, and the closest I get is adb working and the diag port either constantly turns on and off, or doesn't read at all. I'm thinking it might be due to the fact that I can't seem to fully shut off mtp in storage. It only turns off (meaning the screen to switch doesn't open) after I issue the diag,adb command. I'm not sure, but I'm leaning towards this being some sort of new setting for Lollipop, which, if so, I guess I can try writing a script that might allow diag access. But, if anyone has any insight into this, please let me know. Thanks for reading.

-Mike