Rearrange troop que order in barracks
I think we should be able to drag the troop currently building in the barracks around without having to subtract all the troops to get a new troop type to build.
Example:
You have your barracks filled with archers and after your attack determine you need to build some giants for your next attack. Instead of having to remove all the archers from the que to put the giants up to build first, you could add the giants and then drag the archers behind the giants in the order without having to remove and then add them back.