Inserting keyframes for properties that don't already have F-Curves shouldn't occur if auto keyframing is set to 'replace' only (i.e. see timeline -> frame -> autokey mode menu for details).
Inserting keyframes for properties that don't already have F-Curves shouldn't occur if auto keyframing is set to 'replace' only (i.e. see timeline -> frame -> autokey mode menu for details).