NCD, I'm not sure I'm on the same page with you...
When the headlight switch is in Auto position, the headlights will come on when the dash sensor determines it's dark enough outside. When the lights do come on automatically, the instrument panel lights come on and the SYNC (if you have it) display goes to night mode.
Now if the headlights are turned on manually the instrument panel lights do not come on until the dash sensor determines it's dark enough outside.
Given this I deduce that you're wondering about a headlight on indicator for those times when the headlights are turned on manually.
Is that correct?
I don't drive with my instrument cluster lit up like a christmas tree, I like it as dim as possible but still legible. Even if, and I don't know if the truck always does it, the instrument cluster lights turn on when the headlights turn on there are instances when it's not "dark enough" outside for me to notice if the backlighting is on, given that it is a light blue. Also the navigation panel works on a different sensor than the headlights, as far as I know (I may be wrong), but I could have sworn I have had headlights on and the nav system did not go into night mode (aka. a black background) until later.
My wife's MDX's lights stay on auto and when they come on there is an indicator on the instrument panel along with the fog light indicator (which we obviously don't have to worry about). The navigation screen changes brightness at a predetermined setting, similar to the Raptor.
Point being there is no easy visual cue that let's you know if the lights are on during that "gray" area unless you see the reflection on a street sign, another vehicle, or you manually turn them on (then the truck yells at me when I get out).