Reduce hoppers abandoning clans in war
In our clan we regularly get new members requesting to war, then bailing once we start with them still in it. We've tried a few things, including forcing new members to sit the first war out to ensure they're not hoppers, but sometimes we're recruiting with the intention of getting enough war members and new members have to be trusted.
My idea is simple. If a member opts in for war, and is part of a clan war when it starts, they must request to leave just as they requested to join, which shows up on chat, and their request to leave can be accepted or rejected by elder or above. This will definitely make hoppers think twice about whining and begging for war and leaving the minute it begins, which gets frustrating for clan leaders fast.