[winny]

What about a "What if" map. South England, October, Germans have already landed and hold a few of the southern airfields and are conducting free roam flights over sothern England to Mop up the last of the remaining RAF Fighters.

A Dunkirk centred map would make a good team map too.

EDIT : Thought of one more What if map - Last stand in Brittany

The Breton Redoubt. The French plan that was never carried out to fall back to the Brittany peninsular and fight a last stand.
The French armies in Brittany and the Vosges would have a chance to regroup while the Germans were thinking twice about entering the gap between them. The fight would go on..
This would be a role reversal with the RAF having to fly over the Channel to give air cover and bomb German Army positions.