Interesting stuff. The latest post already taught me something I never thought about. If you drive on a hot or wet track you can move the brake bias more to the rear because with less grip the weight shift forward is smaller, and thus the front tires have less grip and thus the rear tires have more grip. This should work in iRacing too (even though realistically you're talking about a few % probably).
When I tried it at Mid-Ohio, it just made a car, with little grip at the back, slide the back more..
God damn aliens...