Since there is the clan wars now, we need at least two different layouts. One for farming (when clan war is off) and one for trophy defending (when clan war is on). So some players including me, need to change the layout sequently for clan war and for farming. Therefore, an ability to save the layout at least 2 layouts is critically needed for players. So players can change they layout once the war start, and change it back (to farming mode of course) when war is finish. Thats all about my suggestion, somebody might have suggested this, but at least I can help the developer to concider about this suggestion more.
This would be a great addition because some clans mostly use hogs/dragons/giants.
Therefore you could design 3 different village layouts and change when needed with a single button.