Well, I have many ideas for the next update:
1. Option to attack own village to see how your defense works!
2. There should be a option to see the level of the buildings while attacking.
3. To give a picture to the clan information (like profile pictures).
4. 2v2 friendly challenges.
5. The MOST important - To see how much time ago the selected player played the game.
6. A personal message option (it will help to send message to a specific person instead of sending a mail to everyone).
I know the last one may increase the amount of spam but there is also a solution for it - Ban the person who wrote bad words using the PM option.
If you really wanna see how long ago a person was online, just visit their base, open the info on any collector or mine, see how much is stored in it and divide it by production per hour... So if an elixir collector currently has 10,000 elixir in it, and that same collector produces 2,500 elixir per hour
take 10,000/2500 = 4 hours ago
Other than that, I agree with TheCrumpetMan's replies