Why not keep it simple?
I'm glad that it has rained a bit at the Basin Reserve. And I hope someone has pointed out to MS Dhoni that it'll get darker an hour sooner there. For hopefully, this lunatic suggestion going around that India should just keep on batting, and batting and batting will die the quick death it deserves. Get the lead to 500 and declare, and give yourself time and plenty of runs on the board to set attacking fields and get the 20 wickets to win. Why imagine the Basin Reserve will remain sunny and dry till the end of the fifth day? And if you don't think you can win despite setting a target of 500 I'd suggest a hunt for the proverbial chullu-bhar.
PS: Given the light situation at the Reserve, its not clear to me NZ will even be able to bat late today (especially as the quicks will be on). Perhaps then India will bat on for as long as they can today and declare tomorrow.