Its as possible as diplomacy can be in a RTW based game, like i said before on VH the ai is more aggressive and will declare war on you more often (even if your allied to them), they also rarely accept peace offers so getting the Force Diplomacy mod is recommended unless you like having to completely destroy every faction you have a minor tussle with.
Ive also read somewhere that campaign difficulty affects naval battles so you get the occasional odd result but these aren't very common if i recall.
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