It looks like that option is $vbulletin->options['yestoday'], and it's used in vbdate in functions.php. So you could probably change that code so that if the date is not yesterday or today, use '0' (normal). I guess you could add a 4th option to the ACP for that, but there is one place in global.php and one place in includes/functions_online.php where it checks for $vbulletin->options['yestoday'] == 2.
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