1) There's 2 forms of PD raids that CJ's have. @priorduck★ has a job that can start raids and Nomad has a job that can assist them. 2 jobs that can assist cannot start them. You need a default/donator or custom job that can start them.
2) You wait the 5 minutes raid timer, applies to arrests as well. (I asked Nomad about this a little while ago)
3) You can counter bank raids.
4) That would be loopholing from my POV, ask docge or Nomad.
5) Pretty sure you can't, once again ask a higher-up.
6) No you cannot as it is still a public area.
-Edit-
7) If you have a job that can raid it and a job that cannot then it's fine. 2 jobs that can't (and aren't government ofc) would be RDM.