No, I don't. I have just seen the question come up a few times.
I believe it would be a good feature to have.

On 6/7/06, Alex Perematko wrote:
> Thank you Robert, you explained it better than I did. This feature can be
> used as a poor man 2-factor authentication and might be quite helpful to
> better secure the networks. I'm just not sure how to get it into OpenSSH. Do
> you know by any chance how I can get attention of any of the OpenSSH
> development team to try to convince them to get this feature in ?
> Alex

And, did Guloka think the Ulus were too ugly to save?