the rebels would not be supported, so CAS is definitely off your list
You are correct, it would not be CAS as there are no friendly ground forces involved. However, the resolution does allow support to civilians - so if a tank was sat there shelling a town, it could be engaged under the current mandate. That was the intent behind my tongue-in-cheek definition of CivECAS. Hopefully someone is thinking about the ROE implications for the upcoming days...