Wow, that's really cool!
That way we get rid of the namespace when sorting as a default behaviour. And you can even override that with manually providing a sort key as described above.
I tried that on Development:Moodle 2.0 question bank improvements with
{{CategoryDeveloper}}
[Category:Developer|Question bank]
as a proof of concept. Feel free to change that according to your preferences
Added that information to Tim's note on Category:Developer as well.
Moodle community sites
Moodle documentation: Using sort keys for category links
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