Choosing War League Size - Leader Only

One idea that sprouted is why not give clan leaders the choice of choosing what league size they want their clans to join for war. For instance, you have a clan of 20 members, you go to war, and now all 20 members are in turn forced to go to war as well. For the casual clans, it'd be a nice feature to lower the league size (or increase it at will) so clan leaders aren't forced to kick people to stay a certain size for clan wars. That way, those that want to stay in the clan and are competitive, can do so without the hinderance of clan mates not participating in clan wars or having to leave the clan and not be able to play/chat with friends and family.