[Q] USB mass storage doesn't work on AOSP/AOKP roms topic

On every single AOSP/AOKP rom I've used since rooting my phone almost 3 years ago, I haven't been able to use data transfering over USB cable. If I connect the phone to my PC, it starts charging like it should, but I never get a prompt on the phone to enable Mass Storage, and no removable storage/devices are visible in Explorer. Is this normal behaviour or am I doing something wrong, maybe some option I haven't enabled in Settings?
I'm currently running NeatRom.

Also, where can I find some modems/basebands for my phone, which are compatible with Android Kitkat 4.4.4.?