Only things I saw unless nano already does them:

* Execute commands (edit: to manage the editor settings).

* Support for shortcuts we're all very accustomed to in other software C+S to save, Ctrl+c to copy, Ctrl+v to paste, etc

* Mouse Support

Nano serves it's purpose but sometimes I need something that feels "modern" so I use TextAdept (works on the terminal as well). I might give Micro a try though.