Hi,
When I tune at night I like to set the colors darker so it doesn't hurt my eyes and effect my night vision (i don't tune while driving) but I don't like the whole car light up by my laptop. Then in the day I have to change all the color settings back to bright colors. It would be a great feature if you had a way to save a color preset and have the tuner come with a few simple ones like default, day, and night.
I do turn the display down to the lowest it can go but it's very adjustable. The difference between the brightest and darkest setting isn't very big. I know this feature is probably low on your list of priorities but it definitely would add more convenience to the software.