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Ennilyn
FYI - the Manage Authors feature provides a button to recalculate all the author_sort values.
I find the easiest way to get to the Manage Authors feature is to right click an author name in the Book details panel and select Manage <author name>. Another way to get there via the Alter Tag Browser button at the bottom of the Tag Browser.
If the calculated value on a specific author is not what you want (eg Chinese names) then you can type the value you want into author_sort field in this list and it will be 'flagged' as valid and not show in Quality Check or Metadata Edit as being invalid.
BR