New idea; locked clan castle troops.
I know me, as well as anyone, has requested troops for war, gotten them, then by the time you next get on, you've been attacked and the clan castle troops you were sent are dead. I have the solution.
Clan Castle Troop lock: a simple setting could be put on the clan castle to allow troops to "sleep" inside the clan castle. This way troops sent to you for attacking can be saved for that, and you can of course still set them to disperse on your war clan castle. I just think a lot of people would agree here.