Pre-War Sabotage / Defense Upgrade
For certain amount of gold/elixir TBD, clans can pool resources to sabotage certain enemy clan members (ideally strongest members). For example, if a clan pools 10M gold/elixir pre-war, that clans leader can use those funds to Sabotage, I.e. disable an enemy's clan castle or certain defenses.
Likewise, the clan could choose to strengthen its weakest members for that war by buying certain upgraded defenses that last for a battle or the war.
Just a way to make clan cooperation/ strategy communication more interesting and to maximize fun during war prep.
THOUGHTS?