Select builder icon to display all current projects
Make the icon that displays how many builders are available (ex., 2/5) selectable. Instead of just showing how many builder's huts you own, when you do so, it displays which projects the builders are working on at the time (ex., 1 builder upgrading an archer, 1 builder upgrading a wizard tower, 3 unoccupied).
This would be helpful when trying to manage what you're working on and knowing where all your builders are at a glance, instead of having to search around looking for them.