I'm finishing a game in PBEM with the North and i'd like to enlight some issues about the entry in the war of France/Great Britain.
First of all, it should be interesting to add some railroad capacities to the South when France/GB join the conflict. Indeed, my opponent is very embarassed with his english corps. He can barely move them out from the Canada or anywhere else...
Another point concern the entry in war itself. In our game it's quiet ridiculous.
French and Britts come into war when the North control 75% of the CSA (Atlanta and Richmond include). Two turn later, I conquer la Nouvelle Orléans but in the same turn Great Britain takes NY city (few days before) and it becomes the new capital city of the CSA...

The CSA in our game is now in 1864 : NY city, Charleston and a bunch of 1 level city in South Carolina.
I don't know how it can be improved...

Maybe it 'd be interesting to forbid the entry in war of France/GB when the North control two major cities out of three. Or, at least, lower the foreign entry level when the North conquers one of the 3 major cities.
I can't imagine a French/English diplomat going to war against Union when South is barely standing.
