I understand what you are interested in. But this means a lot of work for me. If everybody can download these files without authentication, it is useless. So there must be a way to configure a web password as well.
Do you want this for your personal use? For me it is too much work for only one person that will use such feature. I hope you understand this.

Phonerlite has the best encryption features combined with portability and ease of use. So I think everyone would want to use in wider scenario like in office. It is easy to administer, update, it with provisioning capability.

The authentication element I agree is useful, but when its within company, it is ok not to have. But otherwise I agree with you. So yes, its better to have it.

The download part can be done with wget kind of open source libraries, perhaps and the new ini files just replace the existing ones. 

I understand it will take time. But it is useful for everyone. Please see based on your time/priorities. 

I would vote for supporting Video more than anything, and must be highest priority. Next is supporting multiple lines at same time.

Its not really proprietary at all.
It makes deploying phones in a company easy. 
See articles on snom provisioning for example.
Let's say I want to update the phonebook of the user in my company when someone leaves or joins, or I want to change the SIP server IP or the extension number itself ? 
I am not going to go every user sit at his laptop and change it correct ? Instead if I specify a url with user, password for each phone, then I can just change the phonebooks or the settings (including extension and any other details) but changing on my web server. 

Phonerlites will then automatically get that information and update. So it is hugely useful. 
Please see the snom provisioning you can appreciate how useful it is.

DO YOU HAVE SOMETHING AGAINST VIDEO ?
You don't like it ?

Skype is not good in terms of encryption. ZRTP (best) or TLS+SRTP are whatre already needed and phonerlite has this. So its a huge difference between adding video to phonerlite and using skype. 
There is free video codecs for H.264 etc. You just need to add them to phonerlite, and of course provide video display etc. I know its work, but for you I think its going to be far easier than anything you have done on phonerlite. 

It would a huge help to the phonerlite community to have this.

Please support https based provisioning in phonerlite. This is an extremely useful feature.

Ignore the IP-PBXes. Just choose whatever format you want and a way to download from a http / https server or link. 
You can simply just make it download the sipper.ini file itself and replace. That's also fine ! But the exe must do this if the initial sipper.ini sets this option to yes. The url/link and the username, password are also in the sipper.ini

But once the provisioning update is done, the new sipper.ini can have different url and username, password also.