The hose bib take-off from the city raw water is only 6 feet from the filter/softener outlet. Shouldn't I join them with a full port three way valve to be able to select softened water at my hose bibs for washing the car, windows, skylights, etc?

Would I be hopelessly optimisitic to think occasionally filling the hose bib copper pipes with softened water would have any effect on scale? They're new, not scaled yet.