Most of the users are stuck with stock roms, which are working quite. Some roms can manage them too, including t&l and Gingerounay.
Cyanogen and MIUI, from what i can see, are using lgeqcom ril classes, and cannot manage usim response.
Commenting ro.telephony.ril_class=lgeqcom in /system/build.prop at least leads network search and selection, still doesn't recognize the carrier with its name but MCC+MNC.
Still cannot manage all the RIL responses: Unrecognized unsol response: 1037
Working on that.
God bless you!
If I can be of any help (testing, praying, bringing coffee) just ask.
I have no dev skills but if you want you can train me like a monkey