Well, for the Big Week scenario I know they're screwing with the radar so you only get bars or dots in the tower and nothing inflight, so it's not impossible to do. Still, I find it handy to be able to tell what fields I can lift a bomber from and which ones are covered in fleas from the hairball next door.
I do like Sabre's idea of only getting dot dar in the tower and bar dar in flight. That way you'd know generally where to go, and once you're airborne, you'd be able to see where the fight is moving (if at all), but not every individual plane.
As for a 512x512 map....would it really do any good? Sure, you'd extend the border between two countries a little (double it if all works out right), but that wouldn't stop furballs from happening. All I see it doing is making the maps much harder to win, and as it is now, they're not changing much. I could be wrong though; if anyone cares to explain how it would help the game, I'm all ears.