I am unsure if this has ever been recommended, but I doubt I am the only one that would like to see this...
A claiming system for clan war targets. A member would have the opportunity to claim one target that would be highlighted by a marker of some sort to signify to the clan that it is claimed for first attack. That player would be obligated to that target unless request is removed by that person or a leader. Timing of when you are able to call a target and no longer able to give that target up would need to be worked out. People of different time zones would be able to brew an army for a specific target before hand and if not able to attack until a little later, they could still count on that target. This could also help with clans that have multiple levels of town halls and the ability to be a little more strategic with who attacks what target first. Just some quick thoughts...



