1. Sounds interesting. I don't really know, but that might be hard to script. Isn't that pretty much what happens with houses?
2. Dunno
3. Yes! Or some kind of re-structuring, maybe not rigid ranks. There should definitley be a ranking police officer who can kick moronic/questionable officers off the force. newer players who join the police would be lower ranks, yes, that does sound quite good.
4. Sounds too much like the Partyserver. Not sure about this one really.
Really like idea number 3!