I think the thing to keep in mind here is the
strategic scope of the scenario.
In designing this, I had to keep in mind two things: the gameplay area and the limitations of the game. Some decisions, such as which Civs to include and exclude, were easy because of the editor limitations. While including tons of neutrals would be "interesting," it wouldn't lead to a WWII scenario. It's like setting up a giant board game with tons of units and details, but not being able to play it.
The same goes for cities. Some sacrifices had to be made to make the scenario playable. Within that, I wanted it to be accessible to novices too, not just hardcore WWII buffs. Not every city is on the map because not every city was important. In addition, adding more cities would have given the allies a giant advantage over the Axis.
As for the jet plane: I think that with the limitations of the Civ 3 engine, it's pretty good. Sure, we could add different jet units, but I feel that it would just get in the way of the game. In terms of historical accuracy vs. gameplay, the former is less important than the latter. It's a game and it should be played, not studied.
So, that's my rant on the matter.
Mike