If that existed, I wouldn't use it. Without it, I know my 2.6+/3.3+ code will work until 3.7. With it, if 3.5 added a new future feature, my code may only work until 3.4. That's not worth it for the convenience of saving a few characters.
There are only four live future features in 2.6 and 2.7, and you can fit them all into one statement that fits in 80 columns. Which you can put into your project template, and then you're done with it.
And then I usually have one more line, "from sixify import *", where sixify is a project-specific collection of imports from six. (And then the challenge is fighting to stop people from putting non-six-related things into sixify and turning it into one of those "stdafx.h" messes that every windows c++ app has.)