I find this really interesting.
I have read some of the threads about transgender and the numbers of men/transwomen who are asserting eg that a penis can be a female body part are quite astonishing (not here, out there on the internet). So I have a slight problem with transwomen claiming to be female. They're not. They are male but have decided to present and live as women. They are transwomen, which is different from women as a class in terms of experience, biology, physicality, socialisation and so on. I'm perfectly happy to refer to them as she etc and for instance use Caitlyn Jenner's chosen name but she isn't a woman and she never will be.
Rachel Dolezal's case doesn't seem massively different to me. She's not black and never will be but I suppose she can identify however she wants and decide to present as black and be treated as if she were black. It's the deceit that's the problem (and the fact that transracial means something already so it's a bit off to co-opt that term). If she were able to say 'I'm not black but I identify as black' with a clear term like transwoman, I can't see a problem with that.
I'm not white, btw, but I would say I mainly identify as white because my father's culture has had pretty much zero impact on my life and my entire life has been lived much as a white and v privileged person would have lived theirs (private school, Oxbridge etc). I have never encountered any overt racism as I happen to be relatively pale and have reddish brown rather than black hair and people don't really know how to pigeonhole me. I can make a mean curry and roti thanks to my grandma, but I'm not really of that culture. But I do know I'm not white and it is part of my identity that I am not white. But I am kind of white, because I'm not really part of the cultural thing that people from my Dad's country are (he's not been back for about fifty years).
My daughter only noticed at about 7 that my (pretty much never seen the sun) bottom was browner than her dad's - and she thinks I am the default, she exclaimed 'Daddy's bottom is PINK!' and I had to say, well so is yours, have you not noticed. And interestingly, she still thinks she is brown, even though she has light brown hair and blue eyes and is actually quite pale. So perhaps my brownness is informing her idea of who she is even though I only feel very mildly not white.