I wouldn't grease lug nuts. Torque specs are typically for clean and dry threads; lubing them will almost certainly lead to over-torquing. If studs break because of corrosion and DT's over-torquing, they get replaced. I have zerks on my truck's tie-rod ends, and ball joints, but nowhere on my three passenger cars. The only other place that gets greased regularly is my trailer ball just before it's used for a towing task.