At the level of various scripts, patches, etc., I can also suggest a lot of things to balance the game: for Necropolis, a paid transformer unit and/or reducing the hit points of skeletons to 3-4, and for Haven, Diplomacy could be made available at the advanced level – allowing the ability to escape when under the effects of Shackles, and at the expert level – allowing the ability to bribe... In general, and so on. But this is already a bit off-topic. As for the rules themselves, the idea of random heroes for all castles is quite sensible (Swamp and Barbarian, I think, will replace Castle and Rampart in popularity).