Those options only apply to certain rendering styles (shaded is not one of them). Switch to static wireframe, for instance, and they will become available.
This has changed in NX 8.5 where even in a shaded view, you'll now have full control, independent of the settings for 'hard' edges, of the display (color, font, width) of the smooth edges in your model.
John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA Siemens PLM: UG/NX Museum:
To an Engineer, the glass is twice as big as it needs to be.