Hmm, I use a JSON plugin for Notebook++. It produces a properly formatted JSON file with indents.
The build-in mod editor isn't really functional, I think. I use Notebook++ to edit files when I'm in the mood to change things.
But there have been at least two functioning mods made, random portraits and conquest tweaks. The real problem with mods for Conquest is that the game is still an alpha. So significant things change with every new version. This often borks mods completely.
I remember a comment by Mav that he intended to have a story for every unique character. I hope that's true.