I have some proposals for improving the 'Great War'.
First of all, let me tell the way I easily won.
I played Germany from Jan 14 on. Decreased my Navy, which is quite useless. Invented not gas, navy and bomber techniques and doctrines. Started to build artillery guards (infantry) divisions. In the War I stayed defensive in the West, did not attack Belgium, and turned the main force against Russia. Britain stayed neutral. In mid 1915 I had occupied most of European Russia. Russia gave up. Then I attacked France through the French-Italian border. After a week or two, I could also attack from the German border, because France moved armies south. Still no attack on Belgium, and no British entrance in War! When I had nearly occupied most of France, Britain finally declared war (This may have been triggered by occupation of the northern provinces of France.) Then I attacked Belgium. Only weeks after the British entrance in the war it declared surrender because of the French surrender.
Way too easy. So my proposals:
1. The USA will join this war after a few years (1917) whatever the Germans do or do not do (if britain is in war with Germany). The Lusitania-event was only a welcomed argument by the US politicians to join the war, and not the cause for the US to join the war.
2. Britain will declare war on Germany sooner or later, even if Germany doesn't attack Belgium, or even France. If and when Germany occupies some terrain of France or Russia, Britain will join F and R. (Only possible exception: If Russia conquers the Balcans and threatens Istanbul, and Germany makes no progress in the East or West, Britain may stay out of the conflict officially and may support the Osman Empire to prevent the fall of the Bosporus (Istanbul) to Russia.
I propose: Britain declares War against Germany and Austria, when they conquer 1) a province of France of Belgium 2) One of the following Russian cities: St. Petrograd (Leningrad), Sewastopol or Moskva.
Italy will never allow German troops to attack France from Italian territory. Italy stays neutral until the forces ratio of troops in France and Russia is 3:1 for one side.