A lot of time it happened. I usually go with an exact set of troops for raid. Now in between some of my clan member request for a troop which is not in my training list (or coming in some time).
Now I set all barracks in a proportionate way so that the training time is minimum. At this point, I cannot donate else, I have to remove all existing training and re-train.
Only, if I can re-arrange the queue, it would be so so much better. Of course, there is a technicality of a troop in between training. SC can simply reject the training progress in case of re-arrange and restart the training. So if I have a short troop (Level 1 troops), I will go with the re-arrange but if I have a high level troop, I can choose what to do.
Please pour in your suggestions on this.
Sorry, if this is already suggested and/or rejected. I tried to find it in the list but could not.