Just an idea I had to make some interesting matches.
Would it be possible to implement a feature to limit which structures or units can be created during the game? It could be something simple like a tech level selector or could go in depth and select exact units or buildings to turn on and off.
This could make some really fun matches. True air, naval, or land wars, infantry only, no defensive buildings, etc. The possibilities would be endless. Even better would be to somehow have an option to eliminate the country selector and just select a faction, with all the included countries' tech available.
I'm by no means capable of doing this, but if you like the idea, spread the word and maybe it will get done some day.