“Defining role and duties of Head of State as a ceremonial figurehead”
There are really only three questions to be asked about a Scottish Head of State, but they have very complicated answers.
The SNP have claimed they wish the Queen to remain as Head of State if the independence referendum goes Yes in autumn 2014. Certainly this is not a dealbreaker for me: I don’t know how I’ll vote, but whether or not Scotland becomes a republic is not a factor in that decision. Harking back to 1603, the SNP say they wish to dissolve the Union of Parliaments but not the Union of Crowns: a circumstance that applied to James VI and I, Charles I, Charles II, James II & VII, the joint and multi-numbered monarchs William III & II and Mary II, and Anne.
That the current monarch is both Elizabeth I of Scotland and Elizabeth II of England matters enough to some people that the Post Office carefully do not use the EIIR logo in Scotland because if they do, it gets vandalised. It’s not a non-issue.