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Have a look at the options in the Sony device interface plugin (preferences->plugins). You can add your custom column as a column to create collections for. You might have to create another column that translates the yes/no values into strings of "read"/"unread"- I don't have a Sony, so I don't know (and can't test) what name a collection based on a binary column will get.
Oh, and remember that custom columns need to be prefixed with a hash sign ('#').
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