I have made a rough descrbtion in this post, but you are right that proper documentation is in needed, so I have copypasted content of the post to the data storage wiki page so that it's more accessible and easier to update or extend as needed. Or just ask when you find something thats documented wrongly/not enough/not at all

BTW, quick progress update

I have quite a few features in semi complete state:

• stop redrawing when minimized or when the screen is blanked
• a simple heuristics that seems to fix the problem with rerouting while moving (in all the cases I have tested, at least...)
• initial theming support (per theme folders, switching themes without rebooting, per theme color definitions)
• hiding the navigation info box into a button and next/previous turn on-screen buttons

I'll have to put some finishing touches and do some testing, but a new major version (0.21) should be coming shortly.