Feel like peoples response to this topic whenever its brought up always varies because of the Fps limit setting not being same for everyone. Mine is set at unlimited but even then I see my max length viera female ears upper ends bouncing up and down when I run, and when it storms they bend somewhat and shake to whichever direction the winds may be hitting them from, so they aren't entirely stiff as some may claim.

However I do agree it'd be nice to see them brought along to emotes as well like cats have.