Hi Pamela
I wouldnt go so far as to adding another letter but id agree that there is a difference between T and C. I recently found a trans rights group for Ireland but with that said it was for transgendered concerns and less so for the other variations of us, however, CDers have far less concerns than trans people, here in Ireland at least such as changing your gender on birth certs etc. The way I see it for CDers is we, or I would be comfortable with passing in public and thats more or less it. being discriminated against is a crime already and covers everything.
I would say that I wish the trans rights group were a bit more inclusive for the rest of us in the same way on LGBT forums ive noticed a lot of gays want to ditch the T but supporting all of the LGBT in their efforts for equality will trickle down to us too so I see now reason to change LGBT to anything else at the moment.