Revenge would not break your shield
So I've beaten all the goblin levels and now I have no way to play the game that won't break my shield. The single player campaign was a great way to still have fun playing COC while being able to keep your shield. And yes I know that clan wars alleviates some of that problem but that's only for two attacks (that you may never receive the fruits of your labor from) and also only for a 24hr period or every other day if your clan fights a lot.
So my idea (which I did search for but found nothing so sorry if I'm not original) is to allow you to revenge someone without breaking your shield. I see no down side to this and would love to see it added in future updates.