Would be cool to see new units such as Anti shipping missiles in the naval category as well as an expansion of the special units category as It feels under filled to me. Another thought that I had was that you could add a new fed sometime in the future for the special units category. However as well as extending it it would actually reward you with a small batch of units on completion as well. As for unwanted upkeep the player can choose not to do the fed if they do not want extra upkeep. Just an idea..