And now that I'm on the newly released ICS for the D4:
CDMA Only is indeed gone from the open Mobile Networks menu.
The app LTE OnOff does work to take you to the internal phone menu, and you can select CDMA auto (PRL) to go into 3G,
The app Phone Info also works to do the same, but you have to select the Phone Information menu option first. That takes you to the same screen reached directly by LTE OnOff.
Both apps are free, in the Google Play store last I checked.
Thank you for the kind words and acknowledgement.
One change: Since the official ICS update hit my D4, the new global radio changed setting BACK to LTE/CDMA as:
Setting to 3G only is still:
CDMA auto (PRL)