Just Shelly,
I can understand your frustrations. The forum lately has been covered in topics relating to attraction to men and a history of life as a gay man, and this may make it seem as though people have forgotten or are ignoring the remaining facets of what it means to be a MTF. However, I do not feel that you are being fair: sexuality is indeed a very important part of gender, regardless of your orientation (even asexuality). It is often a driving factor in how we express ourselves through our gender and feel content or discontent with it.
For many transgendered people, including myself, it is a very important aspect of self to explore, understand, and seek comfort with, because it will have great influence on our lives and our happiness in the future. Some times exploration of these feelings can be performed through deep, philosophical discussion, and some times they can be explored by simply exchanging opinions with another person of what feels attractive or exciting; the latter happens to have dominated the forums as of late, but it is no less an exercise in self-exploration.
Personally, I am attracted to men. Before I had begun my transition I had lurked on these forums from time to time, and one thing I had noticed was a severe lack of discussion between women who are attracted to men. I did read quite a bit of thought and commentary from women who (previously or currently) posed as heterosexual men, but I found it difficult to relate to their discussion despite empathizing with their hurt and their happiness. It was not frustrating for me, I was happy for them, but I did wish that I could discuss the same thing with women in my situation who had a similar sexuality; I have plenty of natal female friends, and I do talk to them about men, but something about discussing my sexuality with a woman of the same gender-weathered background was both appealing and comforting to me.
The recent threads on the forum, regardless of how distracted and off-key they may seem, do help out a lot of women like us. I thus do not think it is fair to single hetero-transwomen out or shuffle them/us into a subforum, as bi-, homo-, or asexual transwomen have just as much right to express their sexuality in the general forum of being male-to-female. It is a very important part of all of us and indeed has a deep impact on our lives, just as it would with any other human being.