in sling we added a new feature context-aware configuration.
in wcm.io we want to provide a simple configuration editor quite similar to the "old one" we have for the wcm.io config: http://wcm.io/config/editor/usage.html
The configuration editor does not allow to edit all configuration levels or fallback modes. It shows only the configuration for the current inner-most context path (this may be the current site, current language, current region etc.) and allows to edit it. Although the configuration itself is normally stored not inside the context content, the editor page is created there to automatically detect the matching context path. When writing back configuration still the ACLs of the configuration path apply.