[Psitticine]

Themes would be an interesting thing to play with. Even just the ability to add/subtract units and add some inspirational text would do a lot in that direction. Most themes in the game have additional effects, and those would take a lot more work to implement, but just being able to create and add/subtract units, choose "scale setting" prerequisites, and define some flavorful text for various events would do a lot, especially in sync with the power already available with map creation.