So we have useful HTML id=""s in the HTML page source of Special:Preferences for preference headings. For example https://www.mediawiki.org/wiki/Special:Preferences#mw-prefsection-personal-signature is the anchor to the "Signature" preference.
But we don't currently expose links to these headings in the user interface. :-(
This is related to T18691: RFC: Section headings should have a clickable anchor.