[Mobhack]

In WW2 battles where I am fighting with a dismounted infantry force as the default, then I find an 80x80 battlefield best suits that.

Once the grunts are generally provided with APCs then larger battlefield widths make more sense.

Of course, when the battle is generated you can use the "view map" function to look at it and maybe add more time if you think the map requires it. (The game already hands out more turns on some more difficult or jungly maps etc). Scenarios though are stuck with what the designer input for them.