Well, the main advantage of having their own forum is that it would, like the other two forums, be about things their genders would be concerned with and a very good source of support and resources just as the other two are for their genders, regardless of how exactly they define that gender. Likewise, they shouldn't have access to both lords and ladies, as it subverts the entire idea behind those two boards - as safe place for people to discuss gender based issues without qualm or concern for their safety or respect.
I don't think that last came out right, but I hope you get the idea.
That's part of my reasoning for using a non-gender biased title like Gentry, Noble, Ser....it imparts a title of respect without defining exactly a role they themselves are trying or seek to define for themselves. It's a wide swath of many shades of grey, and even male and female aren't exactly black and white.