To the best of my knowledge there is no API for the wide-angle lens, so only the stock camera app has access to it. At least that's how it was on the V20, and I don't see why it would be any different in the G series.
Videoreg works, been using it forever. Can switch cameras between all 3 on the G5. Unfortunately I think google just banned the author's account for some unknown reason so this app is in limbo currently.