I think you’re Santa Claus, or something. 
Let’s see if I can say something more than just +1 to everything.
1: that’s exactly what I was harping about elsewhere, and it’s awesome. How would you work with the content language, that is, how would you make the parsers generate the right links?
Incidentally this approach would not help with my other goal of having inter-document links work on both GitHub and Hugo, but that’s probably an unattainable goal anyway, at least in any sort of robust way.
2: this is even better. Being able to directly link to a section heading would be a great boon for documentation uses. I agree that having .Ref and .RelRef be smart about it would be better than a distinct .Fragment helper.
3: explicitly handling cache busting for assets would also be very good. Also yes, changing a version number of sorts in the filename or path would be more robust than just adding a query string.
Is it Christmas already?