I am currently using the Cm11. M2 snapshot from 1/4/14. Before i installed this app, i decided to try Cyanogenmod installer from their website. The installer doesn't let me select or do anything, as soon as the app runs, it started downloading, wiping your phone and installing whatever rom it download. I ended up using recovery mod to flash the latest firmware but now, everything on the internal memory has been wiped.
I have tried using apps that would enable USB mass Storage but no luck, i was able to get the SDcard to mount and shows up as removable drive but not the internal memory.