This was an interesting comment from WhatamIdoing on bug 67826, so I thought I'd split it out for its own discussion.
> Changing default user preferences means overriding the choices of
> registered editors who actually want the feature (including thousands of
> editors who voluntarily opted-in before MediaViewer was made avaialble
> by default).
>
> It's too bad that MediaWiki doesn't have a good one-click system for
> changing prefs, like a "Click here to enable X" button or pop-up. It'd be
> so much easier than telling hundreds of users "Go to Special:Preferences,
> click to this tab, scroll halfway down, find this item, tick the box, scroll
> all the way down, save the page."
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**Version**: unspecified
**Severity**: enhancement
**See Also**:
https://bugzilla.wikimedia.org/show_bug.cgi?id=32811
https://bugzilla.wikimedia.org/show_bug.cgi?id=67883