Just a Gwai Lo fun within prescribed limits [?]

I usually seek out answers to specific problems I have, but in this case the tip to jump ahead to a specific line when launching nano and toggling back between current and previous directory are useful.

Installation isn't really that easy, requires Terminal.app, and I still prefer multiple windows, so switching from iTerm really didn't improve things.

Bindings for Terminal.app (I switched from iTerm) in the comments.