Hi, just in the neighborhood again.
So, I understand you don't have a simple 4G on/off widget, is that true?
OK, apologies if that's wrong and this is unnecessary, but the Motorola Photon 4G gang had the same issue with needing a 3G widget.
Probably, one of you could review this thread, grok it, adapt it to 4G and the settings path for your phone, and maybe post the solution as a tip on the Nexus forum.
http://androidforums.com/motorola-photon-4g/386947-solution-how-toggle-3g-off-see-post-12-a.html
Anyway, if I understood that there was an issue, maybe that sort of thing might work.
C'ya!