The problem with all these terms arises when someone, like me for example, comes and tells you that has never felt female and identifies male, yet dresses and tries to look as much as possible as a female. But hey, I am not trying to pass, just to look close, I don't wear breast forms and don't plan to.
Either crossgender or transgender seem to point that one is "changing genders" in some way or another. I am not changing genders when I put a dress on, neither socially nor in any sense. So it doesn't cover me, or people like me.
However... Transgender as it is right now, can be interpreted as "transgression of gender norms". So its okay to me in that sense.
The thing is, its better to stay united now to gain rights, and perhaps in the future we can start dividing?
