I feel the same way. I want to see different types of lycanthropes, and each of them be an option for the player.
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I actually thought being a different race in skyrim would make me a different lycanthrope (I made a Khajit just to see if I could become a werelion but sadly...)
As Huleed said, the book actually details different types of Lycanthropy, not the fact that it affects different races differently.
Lycanthropy is a divine disease, created by Hercine, and isn't subject to the differences in races. Regardless of who you are, Altmer, Khajiit or Sload, if you contract the Wolf-Strain you will become a Werewolf, though your abilities in that state are subject to whatever tinkering Hercine has done with the blessing.
I would like to see other types of Lycanthropy, but i feel it would diminish the lore around Hercine if what you turned into was race-specific, rather than disease specific.