A couple of years ago Jerry Bryant put out a CD under the pseudonym "Richard Docker Ph.D." called "Salty Dick's Unexpurgated Sailor Songs." It's a hilariously raunchy collection of traditional chanteys and sailor songs, as well as a few of his own very witty originals. He claims that he got several "uncensored versions of well known chanteys" from Stan himself, probably during a drunken evening or two at Mystic.
As for Stan's lost manuscript of uncensored sea songs, I don't know. I do believe, however, that the Randall Mills Archive of Northwest Folklore, at the University of Oregon, has a collection of unexpurgated chanteys originally intended for Joanna Colcord's book "Roll and Go." She had sent them to Robert W. Gordon for his editorial advice, and he told her that the songs in question should be edited for publication (this was back in the 20s). When Gordon died his papers went to U of O, and amongst them were the unedited chanteys from Colcord. I was a folklore grad student there about ten years ago, and remember looking at the small collection of raunchy songs, but I don't think I made copies of any of them. I think they're still there if anyone wants to make a trip to Eugene.