WAR - In-game base calling/reserving
Despite being appreciative of sites like clashcaller, calling bases via third-party apps and websites isn't an ideal solution.
Calling war bases in-game would allow clans to manage their wars more effectively, and means troops can be cooked for a specific base without the concern that it'll be taken by someone else. My clan has been using caller for a long time, and it's positively influenced our war results, big time. What we really want though, is to be able to do it in-game.
Something similar to the opt in/out button would work a treat, with the option for leaders to assign bases.
I'm surprised it hasn't already been implemented.