I don't claim to have the answers (see book above),
1: The 2016 in/out referendum for the entire UK (depending on tomorrows referendum outcome) to leave/stay in the EU is so much more important. Scots (according to polls) prefer the EU. the centre right politics more prevalent in England are less affectionate to the EU.
2: There are 3 sterlingisation methods described in the Scotland Future book. There are two types of pegging; but the downside for the UK with sterlingisation is that Scotland would not be liable for any share of the UK accumulated debt. Many are seeing the "We will use Sterling" as a game play tactic to force George Osbourne into a corner. The Treasure have already confirmed that the debt belongs to the UK and only the UK. This would leave Scotland with a new currency but with tremendous assets and no liabilities. Many Yesser Scots prefer this - but many in finance would prefer to see a shared currency and for Scotland to continue to be responsible for debt, a shared currency is cheaper to do business in.
The Euro is off the cards because you have to be in the ERM for 2 years with your own free-standing currency. remember when the Uk tried that before?
3: I don't know
4: Citizenship is covered in the Scotland Future book. It's the individuals choice to up until your grand children to have UK, Scots or both. My grand kids will be Scottish only citizens.
5: there are no border controls in the rest of Europe, or on the Irish border, not sure why this is a being played as a big issue. If there are controls, it will probably be on the English side only. Whilst driving in Ireland I had been in Ireland for a few miles before I realised I was on the south side of the border (a road sign had the speed limit in km/h)