Well... I personally don't bother about server-side scripting. HFS is exactly what I needed. And I use HFS primarily for myself.
Till yesterday I used FTPS server (FTP with SSL), but the problem was that FTPS:
* requires special FTPS client
* do not work via proxy so I had to fall back to regular FTP if I needed something from my workplace.
On the other hand HTTPS supporrted by any modern browser and works perfectly via proxy.
So by the time I used FTPS I encountered mild attacks every day. No that they were very successfull...

But HTTP is much more prone to hacker attacks than anything else due to its spread. I don't want to play with fire more than it is neccessary.
And you said - HFS is primarily file server. I agree, but this means that security matters the most. So if I create account that
can access (not even delete) something sensitive for me I would like to limit it at least to go over SSL only. In case of HFS it means "limit to localhost". But if we are talking about new feature lets define it more general - limit to subnet

It can be useful not only for SSL-scheme.
Sincerely I could do it by myself, but it is in Pascal...