There is no support to override address locator properties dynamically from ArcGIS JS API-Locator class when address search request is performed using geocoding service. e.g. address locator is set with MinimumCandidateScore: 80. But when I perform search and if I pass MinimumCandidateScore > 70 then addressToLocation function of Locator class should return results accordingly. Similar way for other locator properties too e.g. IntersectionConnectors.