Thanks so much for the detailed feedback.That’s what we were looking for 
When inserting, moving, or updating the Bibliography the style of the preceding line/paragraph is lost. I.e. if I have a header line “References” with “Heading 1” style applied, this reverts to “normal” style.
We have seen this before and it’s already in our bugtracker.
It’s not clear where the Bibliography itself gets its style from
Actually it should adapt the style of the document when it’s first inserted and when you change it manually afterwards the updates should keep your changes. We will test this again.
It would be nice to be able to “merge” two or more sets of adjacent citations (i.e. as with the Mendeley plugin). This is useful e.g. when copy-pasting multiple references or long reference lists from elsewhere in the same document.
That makes sense. I’ve added it to our feature list. It has been asked for Google Docs where it’s a bit more involved but here it should be possible to add (probably not at this stage but later when things have settled).
When adding or editing multiple citations it would be nice to be able to drag and move the citation bubbles
That’s also already on our list. You can do this in Google Docs and it’s clearly something we want to do also in Word.
It would be nice to have a “Never include DOI or URL” option in the citation style.
This is usually handled by the citation styles. We have the option to always show DOIs, so you can turn off DOIs for journal articles for example which have volume, issue, pages…
But there are citations which only have DOIs and here it would not make sense to not show it. So we don’t have this option.