Wow, I'd never looked hard at the rooting guides for n1e. It does look quite a bit more complex than the NC, NT or NST root methods do, and as a guess I'd say it's down to the device not reading the sdcard first at start time as the others do.
If my guess is right, then it probably can't boot from an sdcard and there's probably not a method that's as simple as with the other devices.
One thing I'd read about n1e modification in general is that software for it is challenging to write, becuase you have to take into account not just the buttons but two completely different displays - different resolutions and only one also acting as an input surface.
