Is it possible to configure the build.transport script to exclude specific files from packaging in?

$vehicle = $builder->createVehicle($category, array_merge($categoryAttributes, array(
    'copy_exclude_patterns' => array('#test#i', '#^__#')
));
$vehicle->resolve('file', array(
    'source' => $sources['source_core'],
    'target' => "return MODX_CORE_PATH . 'components/';",
));
$builder->putVehicle($vehicle);

$builder->setPackageAttributes(
    array(
        'license' => file_get_contents($sources['docs'] . 'LICENSE.md'),
        'readme' => file_get_contents($sources['docs'] . 'README.md'),
        'changelog' => file_get_contents($sources['docs'] . 'CHANGELOG.md'),
        'copy_exclude_patterns' => array('#test#i', '#^__#')
    )
);

...

/* Create category vehicle for all elements */
$attributes = array(
    xPDOTransport::UNIQUE_KEY => 'category',
    xPDOTransport::PRESERVE_KEYS => false,
    xPDOTransport::UPDATE_OBJECT => true,
    xPDOTransport::RELATED_OBJECTS => true,
    xPDOTransport::RELATED_OBJECT_ATTRIBUTES => array(
        'Snippets' => array(
            xPDOTransport::PRESERVE_KEYS => false,
            xPDOTransport::UPDATE_OBJECT => true,
            xPDOTransport::UNIQUE_KEY => 'name',
        ),
        'Chunks' => array(
            xPDOTransport::PRESERVE_KEYS => false,
            xPDOTransport::UPDATE_OBJECT => true,
            xPDOTransport::UNIQUE_KEY => 'name',
        ),
        'Plugins' => array(
            xPDOTransport::PRESERVE_KEYS => false,
            xPDOTransport::UPDATE_OBJECT => true,
            xPDOTransport::UNIQUE_KEY => 'name',
        ),
        'Templates' => array(
            xPDOTransport::PRESERVE_KEYS => false,
            xPDOTransport::UPDATE_OBJECT => true,
            xPDOTransport::UNIQUE_KEY => 'templatename',
        ),
        'TemplateVars' => array(
            xPDOTransport::PRESERVE_KEYS => false,
            xPDOTransport::UPDATE_OBJECT => true,
            xPDOTransport::UNIQUE_KEY => 'name',
        ),
    )
);
// Exclude files with a specific pattern (eg. __ prefix)
$categoryAttributes = array_merge($attributes, array('copy_exclude_patterns' => array('#^__#')));

$vehicle = $builder->createVehicle($category, $categoryAttributes);
$builder->putVehicle($vehicle);
...

...
/* Add the license file, readme */
$builder->setPackageAttributes(array(
    'license'   => file_get_contents($sources['docs'].'license.txt'),
    'readme'    => file_get_contents($sources['docs'].'readme.txt'),
    'changelog' => file_get_contents($sources['docs'].'changelog.txt'),
    'copy_exclude_patterns' => array('#^__#'),
));
...