I think that it would be really cool to have Unit testing option similar to dota 2 where you can summon heroes, decide what level they are etc etc in order to test units. For instance, you want to charge with cavalry unit on some elite spearmen unit, but not in custom battle (in this case you would summon units on the battle map and control both units, let's say some sakven unit vs some orc unit). That Unit testing option would be great feature not only for Warhammer 2 but for all total war games in general. And it would make our lives easier since you alone would control 2 opposing armies. You would also choose what rank are the units, which level are the heroes, what spells do they have.