There are several mounts that could use a /changepose option. There are women who are stuck sitting sidesaddle on unicorns who want to sit astride, and vice versa. There are Miqo'te (like me) who want to be able to sit on a bomb palanquin swing. And now this cloud that would be better if it gave everyone the choice of standing or sitting.

We've gotten /changepose options for standing (weapon sheathed), standing (weapon drawn), sitting on the ground, and sitting on a chair. Giving such options for a number of our mounts seems like the next logical extension of that.