For me I'd love to see more Italian planes for the blue side, if talking about hypothetical future scenarios for the med/north africa desert campaigns I'd love to see the Breda Ba.65, there's a lovely model for FS9, with a gorgeous virtual cockpit, on the Sim Out House website that can be ported over to FSX. I would also love to the se Caproni Ca.310, Savoia-Marchetti SM.79 and the CANT Z.1007. For the above scenario these planes are esential.
the CANT Z.1007
the SM.79
and
the Ba.65