Hello Relic team! Love the game.
As a long term, low priority project: would it be possible to have a sandbox mode implemented?
A single player environment where you can spawn troops (friendly and enemy), turn on and off enemy AI, give yourself free resources and upgrades, etc.
For a working example, see that League of Legends has such a system, and there is a community made Sandbox mod for Company Of Heroes 1 and 2.
All the best!