My opinion is that there are already to many world maps in warlight.
WW2 can be played as a scenario or a diplomacy game. for example on the following mapshttp://warlight.net/Map?ID=5532
Adapt the bonusses, make some important WW2 area's with a huge bonus, especially the last map (6496) is a good map for fighting the Islands in the pacific between USA and Japan.
Be creative in making a WW2 scenario and you don't need a new map for WW2