To further muddy the waters, transablism exists: some people believe that their ideal bodies are ones that have specific disabilities, and are willing to undergo significant trauma to gain those disabilities.

Is this in the spirit of transhumanism? (I want to think so. It's not much different from wanting to improve one's judgement by removing certain less useful circuits, I think?) Is this something that we as a society should allow? (...I have no idea.)

See also Transsexuals and Otherkin.