It can be done with a plugin, but not CB Auto Actions. You'd need to create a new CB Plugin specific to the usage. You can extend the columns using the onBeforeDisplayUsersList trigger. It contains the following variables.
$row, $users, $columns, $allFields, $lists, $listid, $search, $option_itemid
You could simply extend the columns array to 6 instead of 4, or 10, or unlimited; whatever is needed.