Option to drag gizmos only when mouse is hovering over gizmo handle.

Right now, when one of the new transform gizmos is activated on an object, clicking and dragging anywhere on the screen will cause that object to transform.

I'd like there to be an option that enforces <b>having to explicitly point and click on the gizmo handles</b> to make the object move. That way I can drag my mouse to select or deselect without having to worry about moving the object, and without having to toggle between selection and transform modes.