1 . Vectors may be applied for tactical use - mainly this would be sequencing but, as Folower rightly said, Could be to position someone for an easier zone crossing. However, these vectors may NOT be used for seperation. Lets remember an a/c on a RIS could be VFR and may tell you that they cannot maintain the heading anymore.
2. Level instructions cannot be issued to traffic on a RIS. RIS a/c are responsible for their own terrain seperation, and, once again may be VFR and not abble to accept the climb / descent due to cloud.
With an a/c joining CAS and they are changing from their quandrantal the pilot will change when they are ready. However, in anything other than Class A airspace, the pilot could still be VFR and unable to accept the level issued and may require a new / ammended clearance - Remain outside is a good one!!
TIO