Not totally sure what your trying to do, but it sounds like maybe the levels filter might help.
White is overexposure. There is no detail in it to "bring out".
When you were able to with other colors, they were just brighter/darker, not blown out.
Im sure you could screw with the levels. And bring the white point down a bit.
Photoshop can do it, so why cant FCE?
I understand the overexposure piece...I'm not looking to "bring out" the color....I'm looking to make it less "white" or darker I suppose, without dimming out the entire screen.
I'm assuming from your answer that there is no way to do this?
As with green (the playing field) when I did this, there is no way to darken the white?