Pause Barracks Queue

I use on average, 1 dragon and 1 healer on each of my raids.

Usually before I raid, I queue each of these up, because they take so long to create.

From time to time I do not need to use my dragon and/or healer.

In these instances, I end up with more than one of each, which is not useful to me, because I would rather use those 20 unit spots for another kind of unit.

What would be really beneficial would be some kind of "pause production" button.

I could press this button when my dragon/healer has reached it's completion just before I go into battle so that it doesn't just go into my camps, but instead waits, fully trained and ready in the barracks. After I arrive back at my base I could then choose to let it into the camp, or keep in the barracks.

If you could implement this, it would be really helpful :-)

Thanks