Hi @brett-polivka,
I've added it to our Other Feed Types page, and linked this as the official discussion thread.
There's a lot of things to consider in developing a new feed type, but ultimately it all comes down to two things: (1) how much more value does this feature bring to our users, and (2) how many new licenses of ProGet would this feature sell.
The second question is where internal market research comes in, but we would love your opinion on the first question.
Here's a nice and simple way to help understand value: how much more do you suppose your company/organization would pay for this feature if it were available as a hypothetical add-on? $100/year? $1,000/year? $10,000/year? Etc. And why? What time is it saving, risk is it mitigating, etc.
The second part of the value equation is how much effort will it take, technically speaking. It's more than 15 minutes obviously, but is it 10 hours? 100 hours? Etc.
On the plus side, the package format seems to be documented pretty well. However, the registry API has a huge red flag:
The index key should be a URL to a git repository with the registry's index.
Does this mean their API is Git-based, and we'd need to first add private Git repository hosting to ProGet? And did they test it with private/authenticated Git repositories, or just their public (probably GitHub) repository?