For a plugin, both of those would be have to be in the plugin itself, and set via it's own menu. For plugins, probably the best way to progress the feature is to discover and then contact the original developer (or most active recent contributor) and ask them. By their nature, plugins probably only ever have one or two people who know how they work.
Alternatively, set up two single-entry config files with your preferred Rockboy and default backlight settings and select the one you want to use.