Let me just sum up what I said this way -- I don't see how someone can be trans but not queer. So, if you're not queer, you're straight. So if you're talking about someone who is in some other way queer, but you want to say they are not trans, sure, use the term cis. But if you're talking about someone who is straight, why would you need to specify they are also cis?
a lot of trans people consider themselves as being born the gender they identify with. thus, it is entirely possible that they have been 'never gay'.
I don't understand what you're saying here.
gender identity has nothing to do with sexuality. the only reason trans communities are grouped under LGBT is because they were both very small minority communities that had to do with gender topics (in one case, accepting love between the same gender, in the other accepting that some people are born a different gender than their genitals show).
I don't really buy this. Genitals are sex organs. What is the purpose of trying to distance gender from sex? Gender evolved in humans because of sexual reproduction, otherwise we'd all have the same characteristics (like amoebas or whatever).
Let me also say that
I haven't done a lot of reading about any of this so I'm talking out my ass to some extent. I mean, this is the internet, so I'm allowed to do that :) Also,
I'm firmly in the camp of not restricting personal freedoms in any way because of normative bullshit so this entire discussion is completely orthogonal to the question of what people should or shouldn't do. Be and do whatever you want, as I said as long as you're an adult -- for this reason I don't actually think it's that important what we label things because if we allow any and all forms of sexuality then we don't really need to label anything. Even the labels of "queer" and "straight" have limited usefulness.