looks like the reasons are already well listed.
tim, if you're looking to balance the braking load with your car, you could install an adjustable brake proportioning valve. that way, you could dial in the setting you like that would make you feel the most comfortable with stopping your car.
on my probe, i have not done this yet and i really don't need to. you see, i upgraded all four discs (brembo cross drilled), the brake lines (goodridge stainless steel braided), the fluid (motul rf600), and my pads (porterfield r4s). that along with my lowering springs (eibach pro-kit) and struts, combine to eliminate any nose dive i have and reduce the amount ot weight transfer under hard braking.
in the end, these things have helped reduce my braking distance dramatically. on a crown vic, it may be a little different, but the results should still be similar.
hope that helps.