Viewing your ally's map is vital. But yeah, DOWs out of an alliance would be good!
Yeah viewing the map is essential. And I don't even think being able to view an allies map outside of teams is even possible, though gedemon would know better. Obviously it would great if it could be implemented, but not at the cost of blinding the player.
Also are you going to implement strategic bombing? And better planes that can take out troops on the ground?
Strategic bombing is kind of implemented. If you bomb a city enough then some of the surrounding improvements are temporarily damaged. But strategic bombing never really had much impact on the course of the real war anyway so I don't see why it should do so in this game.
Also there are currently two bomber classes that work well against ground forces: attack aircraft and fast bombers, both with their own flaws and uses. Also I think gedemon said that fighter-bombers would be implemented in the next update.
The supply system I think needs a little work as well. One of my tanks was cut off right outside one of my cities in America.
The supply system is honestly one of my favourite parts of the mod. It really forces you to consider the logistics of any battle and really changes the gameplay to make it more in depth. It also forces you to carefully plan any offensives you try, which kind of sounds like what happened to you.
Another thing is the dates of Germany declaring war against all the other civs. The dates are all correct, but when France is invading Germany and then Germany goes on to declare war on the USSR it gets kind of ridiculous. My suggestion is that the AI can't declare war on the next country until a condition is met. Like Germany can't declare war on the USSR until France is out.
Are you playing on a 1936 map? In 1939 Germany generally tears into france pretty quickly, but I know that on the 1936 maps certain countries that should start the war with small militaries are given plenty of time to prepare, meaning that the balance is a little off. As a rule I'd say that unless your playing as France (and a pretty good player) Germany should steamroll france in time for the eastern front. But having germany only declare war on russia if france is defeated would mean that playing as france becomes impossible.