Request Interface
I don’t know if this has been a big one lately, but here’s my proposal for a Request interface.

When you press the request icon, it brings you to the request interface. Here, you can select the troops you want and the minimum level you want them to be. You can only set up 3 different troops and their minimum level requirements. Or, you can select “Anything.”

Once you finish choosing, your request will appear on the chat.

That request will have your message, the bar for CC space, and picture icons of those troops you wanted (with the little level box).

Now, on your profile and Clanmate list, their will be an extra slot next to “Troops Donated” and “Troops Received” titled called “Satisfactions.” This will determine the amount of troop you donated that met the requirements of clanmates.

The “Satisfactions” amount will not be affected if you donate troops via a request set to “Anything.”

The “Satisfactions” count will simply allow Clan officials to see how many troops you actually gave at the requestor’s satisfaction, since if you simply look at the “Troops donated” slot you don’t know if those troops might be "the Lvl 1 goblins nobody wants."

Ban/Demote/Promote Approval Option
Elder's Banning Members, Co-Leader promoting Elders to Co-Leader, etc. must be approved by the Leader or another Co-Leader. This is strictly OPTIONAL for clans, as the Leader can turn this on or off anytime.

Global Ban
Leader/Co-Leaders have the ability to ban certain players who are not in the Clan from ever joining their clan.
This will be useful against trolls who may leave before you can kick them and join again, or unwanted people you find on Global chat. This ban lasts 7 days. Its more effective than changing “Anyone can Join” to "Invite Only" or "Closed."

Clan Select/Bookmark
When searching for Clans, you can bookmark clans so that you wont have to record their ID or lose them. You can only Bookmark a certain amount of Clans though (Maybe 3?)

Clan War Three-Star Problem
Sometimes, clanmates in war might choose to attack a base that has already been three-starred, just for the Loot. Well, I say that when you attack a base that has already been Three-starred, you do not get the victory loot if you win, and instead, you only recieve the loot you stole from the collectors/storages.

Sort the war loot you earn by amount of stars
If you three-star a war base, you get all the victory loot.
If you two-star a war base, you only get around 2/3 of the victory loot
If you one-star a war base, you only get around 1/3 of the victory loot

Inactivity Tracker
There is a slot next to the Troop Donated/Recieved slots that show you approximately the time between now and the last time the clanmate left a reply.