I hesitate to get into discussions about anything transgender unless that word is defined by the user. It means so many different things to different people that it ends up meaning nothing. To me, it's the umbrella meaning, and includes everyone who identifies and/OR expresses in varying degrees as the gender opposite their sex.
I read the OP but not the book. I don't think the use of transgender in either the book or OP is meant to include crossdressers, especially crossdressers (like me) who have strong male identities and like it, but enjoy crossdressing at times. This may sound strange, but I think it is that maleness (and my male response to feminine things) that drives my crossdressing. Maybe a topic for a separate discussion.
So it's not surprising that crossdressing wasn't mentioned.
I don't think that TS and CD are peas from the same pod that went on different development paths. We are fundamentally different in many ways but often are mentioned together because of one thing we do: wear women's clothing. Even in that, there are differences in how and why we do it.
I have a forum friend with much in common in both crossdressing and non-crossdressing, and we discuss both often via PM. I identify as TG,a male-identified CDer under the TG umbrella, but she, also a male-identified CDer, does not consider herself TG because she does not identify as a woman. To better communicate, when someone uses transgender, it would help to know what they mean. Sorry, but "everybody knows" isn't so.
