Rob is right about lining up the B Mains by heat finish. And honestly, there is less sand-bagging than you think. Sometimes, a car that qualifies well just isn't fast enough to move through the pack. It happens. I have rarely, VERY RARELY, heard or seen a guy take it easy to start up front in the semi. Honestly, I have seen cars go out no matter where they drew and qualify well. Each night. I love Chad Boespflug, but he was not treated unfairly at all - he just got himself behind the eight-ball. It's possible to race out of that, such as Tracy Hines and Chad Boat have done. When Chad qualified better, he had no trouble making the feature. You need to treat qualifying as the important part of the program it is - that's why I love qualifying so much, and why it's such a challenge to run well in USAC races.
Adding another heat only waters down the talent. Keeping the talent stacked into four heats means you have great racers from top to bottom. And when that happens, you get heat races like the first one on Sunday. That was the best heat race I've ever seen - and, oh yeah, the fast qualifier transferred through that one by racing his ass off, just so he wouldn't have to run the B.
Two B Mains leads to one being more stacked than the other. There's nothing I hate more than seeing two Bs at a local show where one is absolutely stacked, where I feel like five cars from one could have transferred from the other.
Also, the problem with Broc's theory (although I like thinking outside of the box) is that you're still drawing for your heat race, and heats can be very much stacked against somebody or for somebody. What if your heat race group includes Levi, Tracy, Darland, Gardner, Hagen, Whitt, Bacon, Sweet, and Short? It's a fair format as long as you all qualify on similar track conditions, right? Even if I got in a heat with Chuck, Cecil, Rob, and a bunch of other guys you know you can beat?
I'm sorry, but I've watched qualifying for four nights pretty accurately seed everyone into heats, just as it always does...