BTW: Anybody remember who gave Dulmur his definitive spelling, and when, and in what opus?
The Dulmur spelling comes from the original shooting script for "Trials and Tribble-ations," and appeared in David Gerrold's novelization which was released in the same month as the episode (its December 1996 publication date means it was on bookshelves by mid-November). So the correct spelling was there from the beginning, and was also used in Dulmur's first original prose appearance, the young-adult Deep Space Nine: Trapped in Time by Ted Pedersen in February 1998. As far as I can tell, the "Dulmer" misspelling first appeared in Strange New Worlds II in May 1999 and New Worlds, New Civilizations in November '99, and was used consistently in Pocket fiction (including "The Road to Edos" in New Frontier: No Limits in 2003 and ST Online: The Needs of the Many in 2010) until I restored the original spelling in Watching the Clock.