Introduce a new config form section / group "User Modified"

[lhein]

This group will host all the fields the user has been modifying so far (diverging from the catalog defaults). Additionally each field will have a "Reset" button to fall back to the default value hence removing that field from this group.
Also additionally there will be a top button in that group called "Reset All" which allows to quickly reset all user made changes and hence emptying this group.