1: Im not sure what MoW:AS has as its front but MoW is Rommels Afrika Korps, US in Africa and a few Russian missions that quickly send you through to 1945. Almost all of them in the Russian Campaign are defense based missions.
2: Im not sure how hard it is to create the missions you want but ive messed in the editor and its plenty easy to just set up units nad kill each other. As for actually making the mission, scriptin, map making and the like, looks more time consuming then it does hard. Ive got nothing on 4 and 5.....the itialian buildings bit, idk what they look like so I cant tell you if the game has em or not. All I do know is MOW is like the best ever RTS game, CoH is kinda cool but MoW is better