Just a random idea that occurred to me. When doing FTS from a desktop browser, through the Content Server, there are only two options upon clicking the results snippets: 1) one can click the book format link, to read the book within the browser, which opens in the page that contains the result, highlighting it; or 2) "Reindex the book".
Could these new link options be added? Pic below is what I see when I click a result in Content Server FTS:
calibre://book-details/ - I think this one could be opened, if possible, within the browser.
As for calibre://show-book/ and calibre://view-book/, I'd personally prefer them to send me back to Calibre Program/ Internal Viewer.