Allow clan leader to toggle war opt-in flag on members.
Pretty simple -- as clan leader, I'd like to go to a member's profile and "opt out" so they default to "out" for future wars.
In highly competitive clans this isn't an issue, but in my clan (which is much more casual), people frequently lose connectivity for a week or so at a time and don't remember to opt out. Once I notice someone's not making attacks, I'd like to be able to toggle the option for them and leave them to re-enable it when they get back. Keeping track mentally/manually for 30ish people is a chore.