I recognize the difficulties with allied countries sharing objectives, supply, theaters, etc. If that is not the intent until an expansion, then that is fine. However, this does break a lot of the coherence of the game.
The second main issue is that of the AI creating a reserve. As noted, this is also not possible until an expansion. But the current AI strategy (flood the front line will all forces, weaken the line to react to threats) causes problems for the AI when the Theaters expand.
However, what about the possibilty of having more expeditionary forces on shared borders - expecially when combat occurs? Or have allied nations participate in combat along shared borders? ie, say as Ger, I can join a battle that my ally Romania is having with the USSR, but I don't find that Rom will join a battle that I am having with USSR even though it is a shared border. Perhaps a % of a country's forces devoted to expeditionary forces (with % determined on proximity to opponents?)
The possibiity of assigning your expeditionary forces to a theater? ie, as USA, if I give a Inf Div to the UK, it would be cool to have the available theaters pop up and have me assign the div to say north africa...
I would like the option to pre-order the Expansion on GamersGate! While this is a masterpiece in waiting, I don't think (even with 1.4) that it will be there yet. As I recognize that Finances (and product demand) drive the decision making process, what better incentive to start to work on the patch than knowing that there is a set market for the product...