The really long acronyms I have see are GLBTQQAAI, in very liberal places
Q:Queer
Q: Questioning
A: Allies,
A: Asexual
I: intersex.
So it is out there, but I think most people just say GLBT as that is what it started out as and so people have stuck with even when they include things that have been accepted longer like Allies and Questioning.