Clan administrative event log + Coleaders can delete clan chat messages.
Very simple. Whenever a elder / coleader does something like starting a war, changing clan description, trophy requirements, etc - we need a log to be able to see which player did it. Log needs to be outside the clan chat where events don't get buried.
My clan was recently forced to demote a bunch of coleaders because we couldn't figure out which one kept opening the clan up to "Anyone Can Join" and we subsequently get spammed by 20 guys who all cuss in the chat when they're not immediately promoted or given troops.
Also, why can't coleaders delete messages from malicious clanmates who join, say f*** 40 times when most of our clan is elementary school kids, then leave?