If you're going to do this, it would be good to also add a "patrol" function to ships you have in orbit, but that you also want to stay put. I often leave ships in orbit as a deterrent to would-be attackers and I want them to stay there. Similar to the way you can currently see harvesting and trade ships in autopilot, but can't select them, these patrol ships would not be selectable from the proposed sector view. That way you could, while in sector view, distinguish between ships you want to move around and ships you want to stay put.