I'd like to see something similar in the form of a switch you could flip for repair bays/structures so that they'll repair civilian ships within their ability radius. This would help keep construction frigates from dying in combat and give trade ships that little extra bit of strength to last through dangerous trade routes.
Perhaps have three settings for the function; A. Repair fleet and structures only, B. Repair constructors, fleet, and structures only (To keep your repair bays from wasting antimatter on trade ships during a battle), and C. Repair all.