Finish boosting everything same time
I thinking would be absolutely awesome if you could boost to where every troop, potion and hero finishes at the same time. Normally every thing cost 10 gems to boost (army wise). There should be a more expensive penalty for everything finishing at the same time like charge 25 gems each barrack, hero, and potion factory for them to finish all at the same time. That way when you attack, everything will be ready. Maybe a waiting duration of 30 minutes for everything to get done at the same time.