I have not personally had these issues but they are becoming more common maybe you should find a way to address things like sex changes, sperm donors, foster parrents, and other complications of modern family life.
I would like an indicator that is put on a persons profile that states Never married, like the died at war icons etc. It's time consuming when you have a HUGE tree, to check someone indiviually. And, for example, I have never married, and never will I hope, but in the tree I have a Spouse box next to me, how do I get rid of that. A LOT of people never married it needs to be addressed I think. Not that I don't love FTB I do, and recommend it to everyone, but it could use development - who couldn't!
I use the "imaginary" spouse Did Not (first name) MARRY (surname). Not only do I see right away that the person never married, I don't spend time trying to look for a marriage record