Map Units of Grid in Print Should Follow Selected Coordinate System

It appears that when selecting "Map Units" in the Grid drop down of the print interface in the HTML5 viewer, that the units are displayed for the underlying spatial reference of the site. It is suggested that these instead should use the coordinate system selected while in the viewer. Otherwise the user will likely not know what coordinate system is represented by the "Map Units" selection. Alternatively, have an option to disable the "Grid" field. Thanks.