Another idea that's been brought up is scaling the minimum troop amount based on the amount of attacks made from a city. I believe another CM said Tribal Wars has a similar feature. So currently the minimum is 3% of the cities total population but this idea would have that increase as you send attacks from a city. How much it would increase and at what point it would increase (after 1 attack, after 5, etc) isn't clear. So this idea might reduce spam but it doesn't do anything for the attack and cancel spam attacks. There's also talk of increasing the minimum troop requirement for all attacks up from 3% to anywhere from 10% to 20% but the biggest issue there is harbor checks. Making the minimum increase that high would nullify the ability of players to do harbor checks which we all know is a necessary game strategy.