They responded in just a few hours. Kinda' nice; lookie here:
"Hi,
Thanks for your message. We totally agree with you, and we're actively working on adding non-binary gender and orientation options. We want to make sure we get it right, and leave flexibility for people to choose whatever identifier they're most comfortable with (instead of just adding a third option labeled "other" and leaving it at that), so it's taking some time. Please be patient with us as we work at this, and hopefully you'll be happy with the updates when they're ready!
Thanks,
Adam"