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as far as i know, this hasn't been done yet.
and your only option is to Root and install a custom ROM. CM7 and all its variations (liquid, OMFGB ect) have a power control widget built into the notification pull down. one of the options is a 3g/4g toggle. click it once and my 4g goes to 3g in about 2 seconds. click it again, and i am back on 4G in about 5 seconds. one of the many things i LOVE about CM7.
Rootzwiki.com usually.Sorry that this is offtopic, but where do you get your CM7 ROMS?