The novel Forged In Fire, while mostly being about Sulu gaining command of Excelsior
, focuses heavily on the origins of the Albino. It's been a while since I've read it, so my memory's a little sketchy, but from what I recall, he's Klingon, the albino-ness stemming from his mother attempting to cure the Augment virus if not for herself then for her son, because it would let him claim his family name and position.
I'll agree about the under-development of Jadzia as a separate character from Dax. I happen to love her, but I openly admit that it's pretty clear that there was a better understanding of who Curzon was than who Jadzia was, so they just made her Curzon-lite. It'd be interesting to have seen her question if she was still Jadzia or if Dax or Curzon had overwhelmed her. Don't we even see that to a small extent in Season 3's Facets? Would have been nice if it had led to a story for Jadzia. Ah well. Missed opportunities and all that.