I think a builders queue would make a great addition to the game. A builders queue would be a small list that the user selects for future building upgrades. When a builder becomes available, they would automatically start on the next building upgrade in the queue.
Assuming the user has enough gold or elixer and has buildings lined up in the queue, there would never be a break for the builders.
I think this benefits the advanced and new users. I would list out the benefits but I will let the community soak this in and come up with their own.
