Hi! More advanced diplomacy like relationship bars etc will not be in the next release, as this is already in beta on Android (though I am trying to chase down the notorious crash bug so it may take a while). I do want do have more advanced diplomacy in the future, but it's very hard to get it right :)
Truce I'm not so sure about, you think it should trigger automatically after some time? Would it be the same as peace? What would be the point of it? :)