Slow attackers wasting my boost
My regular usage of my daily boost is to speed up my troop training while attacking. Often, I see people dropping troops (archers usually) one at a time to try and take out a single structure, then move on to the next one. This takes almost the entire clock for the attack, and after a couple attackers like this, my boost time has been wasted waiting for them to finish. It also happens when a single bomber is left that's out of range of defenses, but keeps tossing bombs at walls until it comes within range of a defense, which can take a while.
I would love to see a feature where I can surrender on a battle I'm spectating and I can see I've lost on percentage or stars. Let the other attacker finish their attack of course, but let me get on with my attacks and don't make me wait on their slow strategy.