Sink I know what you're getting at with perpetual sc if there was a financial incentive but even a live in baser like me has trouble with sc since I live on the north side of ATL. I don't think 80 hrs a month would be enough for me to live in SC unless I lived in peachtree city. I guess you could name it long call and peachtree city short call. Problem is it cause commuters in NYC, LAX and DTW a lot of angst to have a SC only line.
Personally SC should give you the same raw score points as a 5.15 day trip. That way you can build a score and be less likely to be called next time. I'd had a raw score of 180 instead of 123 this month if I got credit for SC.