I doubt using emotes of the opposite gender will ever happen just for the headache it would give. Similarly trying to convert each and every emote to fit every race/gender might be too much of a task. However giving alternate animations for some emotes should be doable. Sit and Doze (When on a bed.) originally had a single pose each. Eventually more were added you could toggle through just like idle stances. Give it time and if there's enough of a demand we'll probably see it sooner or later.