Dax,
It’s not that complicated. All you’re doing is telling the camera what ‘white’ is under a certain lighting condition. In a situation like you described, you’d just take photos under clear and cloudy situations during the day’s shoot. As conditions changed, you could just switch over to the appropriate image. It’s the same thing with a dedicated video camera except you would use custom WB presets made under clear or cloudy conditions. No need to sweat or do torturous research. Like I said, the process is clearly described in the T2i Manual on page 99. Don’t over think this. You’ll just give yourself a headache and won’t get stuff done.
