Seriously, though, a dot on the map wouldn't make it any faster, and might even make it take longer.
You fire up the scanner, and it shows the direction to fly, including vertical angle. But you want a dot on the map, too, and I assume you would then look at the map, swing your ship to the right heading, and fly until you got to the dot and look for whatever it is.
Doing it that way, you could be directly above or below your objective, and we all know already what a PIN getting to it would be from there.
If, however, you align your view to the scanner directional, including vertical angle, then fly in that direction, you'll see the objective when you get near it. Or, if you've gone a ways and don't see it, scan again to fine-tune your direction.
You have to go over there any way, a dot on the map would not save you any time.