Hello. I am not Legalman and I hope you don't mind other forum members commenting here.
I also had a Quota Permit and got my PR
through that so I thought I can help with some answers.
(4) My application took FOUR months. (submitted 05 Dec 2013 and collected 15 March 2014). But it differs. Some takes 3 months some 2 years.
(5) I applied together with my wife and my child. We all got it. They actually encourage you to submit together.