After some thought, I've had what I think is a brilliant idea for clan wars. In my idea the army you use for clan wars would be trained through the clan wars screen, similar to how you can edit the war base through village edit mode in the war tab. This would allow you to keep training your farming army and spells for multiplayer, and I think it could incorporate active heroes so you could have them during an upgrade. It would be just like training a normal army, except it would be just for clan wars. I think it would be helpful, not essential to the development of the game, but an all around nice feature.