Just something I was noticing on the mass PBEM that is being posted on another forum.
For the player or players, it is too easy to know when a nation will either join with your faction or your enemies.
It would be an interesting option to have the values of the diplomacy hidden, you would be able to keep track of were each nation maybe up to. But it would hinder the ability of the larger nations to move a force ready to pounce in the the lesser nations and knock them quickly out of the war.
Just a thought.