village troop defence

Have you ever opened clash of clans while some one was raiding you and watched it live?
Because if you did, you probably know how frustrating it feels when you watch him destroy your base, while you can do nothing about it.
So I was thinking that when you log in while being under attack, (what nearly never happens) you will have 2 options,
1) watch
2) defend
If you choose to watch the raid, you just watch the raid live, like you can do now,
but if you choose to defend, you are basically fighting against the attacker.
In defend mode you can deploy the troops that are in your army camp where ever you want, as long as it is on the red area (the one surrounding your buildings), and they will automatically fight the enemy's troops (like the troops from your clan castle).

Another idea that comes along with this one, is that your friends and clan mates could defend your village in enemy raids and in clan wars.

I bet this idea was already uploaded, but i think its a very good idea, and i felt like i had to post it, just in case it wasn't already posted. Sorry there are a lot of "but"s and "if"s.