Fork, not sure why you find it insulting.
Salmond's chose the end of the term because he knows if he had a referendum early, he'd lose it. So his game plan over the next few years is to blame as much on England as possible, whip up as much anti-union sentiment as possible and hope by the time of the next election, enough people hate the English to want to seperate.
On the other hand, DC doesn't want the union to break up, so he wants to move the vote forward because all evidence at the moment points to Scots not wanting full independence.
Both are examples of politics in play. It's hardly insulting though.
And as for political parties trying to influence the outcome, isn't that exactly what political parties are for? Once the referendum goes ahead, it will be a crossparty coalition (Tory/Labour/Lib Dems) versus SNP.
Up until now, Salmond has been allowed to dictate the terms of the debate. To be fair it's nice to see this being brought to the forefront of the news.
The only thing is that we need to be careful it doesn't appear to be a diktat from Westminster or we risk losing support.