In my experience allowing fantasy races in these sorts of things usually ends poorly, but that said if others really want different species I am willing to allow Human subspecies.  That is of course if the people who want them can describe how they have arisen and how they fit into the greater world.

If you wanted to you could make such a sub species with elf like traits, but the trademarks of elves like magic and immortality?  I'm going to have to say no to those.