I'm currently a lalafell for the cosplay, but my race normally is viera and I agree that it would be nice to have more movement physics to the ears.
It's a pipe dream but I think it would be fantastic if they did it alongside the work they are doing for the hats, but nothing has ever been said about it.
Granted, there is some movement depending on what you do, as often when I'm thinking I either tap my movement keys to move back and forth or run around in circles, but I would still like to see more.

Maybe in doing so they can edit the ear wiggle emote to use the viera's actual ears like it did in the material shown for new years rather than summoning loporrit ears.