sEconomyNow before I go throwing what could be very stupid suggestions, I would like to say that Call of War has quite a unique combat system, one that I definitely like and and one that gives it a massive competitive edge over other games.
But the other sides to it, I think are quite lacklustre.
I have a whole mental list of things that could be done, but let's start with the simple things:
Diplomacy
Group Chats - I can't count how many times I've needed Group Chats - to organise a group invasion, to settle a peace deal, to make a wider alliance to face a threat, etc.
A Fear Measure - An AI will declare war on you when you get a low popularity, but this wasn't always the case in history. Many leaders were scared of Hitler and Stalin and Hirohito, yet they didn't declare war on them because they were scared of their military might. If you can give countries a percentage of how scared of you they are based on how much land you have and how many countries you have invaded, it would drastically reduce the amount of AI declaring war on you late game
Advanced Diplomacy - Non Aggresion pacts - u wont be able to attack unless you break it, where u lose a lot of ur popularity, Defensive Pacts - automatic declaring war if ur ally is invaded, Peace Conferences - being able to give multiple things at once, and being able to seamlessly negotiate.
Economy
This is going to be a paragraph:
Carking the 6th talked about this in another thread, but the Stock Market becomes pretty obsolete late game. As well as this, if ur good with resources, you wont need it at all. Hence why I propose (maybe only in HWW) that resource production location is realistic - the same as real life geography. Arabian Countries would mostly produce oil, for example - the UK would only produce wheat, steel and rare resources. That way, u DESPERATELY need the stock market, and it adds some strategy as to where and what to invade.
This can then be combined with another feature - trade convoys/ships, trade routes, blockading and escorting.
This has been absolutely instrumental to victory in World War 1 and 2, where countries like the UK, Germany and Italy were brought to their very knees because their trade routes were blocked. Again, this would maybe work better in HWW, where there is already a role play theme in place. You would not only have amazing trade ships and convoys, but you would have guard ships/escort troops to protect these routes from submarines, which could destroy the convoys, OR battleships, which only has a chance of plundering resources from that ship.
Thats it for right now, will add more later