Sorry to keep banging about this. Another thing is, I don't know about nthn but I see application's settings a part of the application's data. There are two related aspects.

One, application data should be sandboxed. No one other than the application itself should have access to it.

Two, if we share some part of the application data and let another application manipulate it, where does it end? Why not have one central application for all other parts of all applications' data? How convenient would it be to edit received messages, playlists and game scores from Settings as well?