Similar to the ability of survey ships to "auto" survey.
What about auto construct. As a constructor is launched (automatically on completion) it navigates to the nearest starbase that requires upgrading. This would be an option that can be turned on/off as needed. maybe a waypoint called "nearest starbase"?
I find it a distraction to route constructors to starbases during times of war or when there are lots created over a few turns.
thoughts?