Regarding Spain... anyone who's played the big WII war games (World in Flames, Totaler Krieg, The Struggle for Europe & Asia, Unconditional Surrender, etc.) can tell you that if you're the Axis player you REALLY don't want to roll Spain into the war. It adds a long coastline that needs to be - and can't be - defended. If you try to defend Spain it draws off troops that are needed in more important theaters. It makes an Allied invasion much easier, and then you have an area that can be directly reinforced.