Allow coleader and leaders set members opt in/out preference?

Wold it be possible to allow coleader and leaders set the opt in/out preference for members? Or at least default it to out when someone joins a new clan?

We try to use it as a way people can flag if they want to war..but people go afk for periods of time with it enabled. ..then there are those that don't seem to grasp the concept of the flag.. having the ability to turn it off would give the ability to manage wars alot easier!

Kindest regards

Bal