To play devil's advocate here. Most of his really whacky stuff is on the talk pages of articles rather than the article itself. He has never made an edit to cold fusion for example (AFAIK) only the talk page. I've been participating in talk cold fusion and talk dolphin brain, and although there has been much mumbo jumbo I didn't spot any personal insults (I am thick skinned however perhaps I didn't spot them).Anyway what I wanted to do was pre-empt any talk of a ban, which I don't believe is appropriate at this time and instead suggest a message be put on his talk page stating what is and what isn't appropriate to put in article pages, talk pages and other user pages.
Theresa
P.S. After rereading Nathan's post, I see that he wasn't actually advocating a ban, but just bringing Krhaus to the attention of the list.