I don't see why not. Ford may have given it a name that implies it is for the track, but in reality, Ford always tunes the car for too much daily driving in it.
What I mean is even their performance cars are too watered down from their true potentials because Ford has too much emphasis on street and daily driving.
The TracKey tune was initially held up from the public for so long even after the Bosses were already on the street because of EPA considerations. I cannot remember exactly when the TracKey became available to the Boss owners, but it was not until after Ford had worked out those details that would allow it to be used on the street.
TracKey was delayed because of CARB. Cali might have objected the changes to the engine parameters and the elimination of skipshift.
But according to this article, FoMoCo apparently convinced that TracKey is still CARB compliant.
I don't know if Ford retweaked the TracKey tune or if it remained exactly the same as it was intended to be released at the time the very first Boss was to be sold.
In the end, TracKey is 50 state compliant and there is absolutely nothing wrong with using only the TracKey tune.