I am happy I discovered this excellent game only now, 5 years after release. It is gem, now very well balanced and pollished. I have seen also the Civil War, but it is 3D. I have seen there a lot of improvements, but this game has it's own advantages. It is small, it runs smooth and fast on low-end hardware.
I would appreciate more custom battles and also smaller battles where player can focus to few formations. It wouldn't be difficult to produce - the production team produced much more complicated battles. The distribution of additional custom battles would be also simple. I guess all data about battle are included in only one file.
The maps consist enough of different terrain. The number of existing maps is adequate and usable for new custom battles. The advantage of this new multiplayer custom battles would be: it would be fun to play in Single player and also in multiplayer.
I would appreciate at least ability to delete some units from existing custom levels just to make battles less crowded and easier to control without PAUSE.