[Sven]

I'm share your curiosity why Oleg would put his minds on Invasion of Holland, Belgium, France and Poland or any other relative small conflict as a complete addon, you could think of something bundeled together as in: The rise of the 3rd Reich ( That sounds very very wrong ) which includes all these conflicts in europe but not the BoB ( part of it's downfall ) and the Battle for Moscow ( together with Stalingrad turning point of eastern front), but that all will be very one sided, as the Germans completely ran their opponents over.

I think the best is what they do now: Focussing on turning points in the war. Mediterranean theatre, Battle for Britain and the Battle for Moscow, it gives the most enjoyable gameplay for Both sides and provides a good basis for further 3rd party addons and whatnot.