Words fail me at the moment He must not know anyone with a welder. Weld a bolt into/onto the stud. The heat alone would probably break it loose
What a maroon!! THIS is the proper way to loosen a bad lugnut:http://www.kitsapsun.com/news/2007/nov/10/sk-man-hurts-himself-trying-to-loosen-lug-nut/
Looks like a hex key (allen head) cap screw to me... Give me few minutes with a die grinder and the head will be gone with no damage to the wheel.