small correction
[2] should be https://gerrit.wikimedia.org/r/#/c/156838/

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Regarding the Special:Preferences page, could we consider putting the Save button at the top-right of the box, instead?

There are many users who are used to the modern systems like Gmail - where no manual "save" is needed, but instead happens automatically when anything is changed - and are liable to miss the Save button anywhere at the bottom, especially on longer preference pages.

In the RfC for userpreferences, I'd suggested that "The [Save button] is always visible/nearby" should be a high-priority goal. (Or, upgrading to an auto-save system). [1]
Having it at the top of the window would be ideal, and possibly even top and bottom, like so:
https://i.imgur.com/4Mu9UdQ.png

[1] https://www.mediawiki.org/wiki/Requests_for_comment/Redesign_user_preferences#High-level_requirements