Niestety nie ma legalnego sposobu, aby to kontrolować. Ale jest brudny sposób, aby to zrobić… Jeśli wybierzesz tę drogę, będziesz musiał:

• klonuj standard gallery_shortcode funkcjonować
• dodaj wartość domyślną dla $attr['link'] opcja
• podłącz swoją sklonowaną funkcję do post_gallery filtr

Końcowy wynik będzie wyglądał następująco:

add_filter( 'post_gallery', 'wpse8170_gallery_shortcode', 10, 2 );
function wpse8170_gallery_shortcode( $output, $attr ) {
    $post = get_post();

    static $instance = 0;
    $instance++;

    // override default link settings
    if ( empty(  $attr['link'] ) ) {
        $attr['link'] = 'none'; // set your default value here
    }

    if ( !empty( $attr['ids'] ) ) {
        // 'ids' is explicitly ordered, unless you specify otherwise.
        if ( empty( $attr['orderby'] ) )
            $attr['orderby'] = 'post__in';
        $attr['include'] = $attr['ids'];
    }

    // We're trusting author input, so let's at least make sure it looks like a valid orderby statement
    if ( isset( $attr['orderby'] ) ) {
        $attr['orderby'] = sanitize_sql_orderby( $attr['orderby'] );
        if ( !$attr['orderby'] )
            unset( $attr['orderby'] );
    }

    extract(shortcode_atts(array(
        'order'      => 'ASC',
        'orderby'    => 'menu_order ID',
        'id'         => $post ? $post->ID : 0,
        'itemtag'    => 'dl',
        'icontag'    => 'dt',
        'captiontag' => 'dd',
        'columns'    => 3,
        'size'       => 'thumbnail',
        'include'    => '',
        'exclude'    => ''
    ), $attr, 'gallery'));

    $id = intval($id);
    if ( 'RAND' == $order )
        $orderby = 'none';

    if ( !empty($include) ) {
        $_attachments = get_posts( array('include' => $include, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );

        $attachments = array();
        foreach ( $_attachments as $key => $val ) {
            $attachments[$val->ID] = $_attachments[$key];
        }
    } elseif ( !empty($exclude) ) {
        $attachments = get_children( array('post_parent' => $id, 'exclude' => $exclude, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
    } else {
        $attachments = get_children( array('post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
    }

    if ( empty($attachments) )
        return '';

    if ( is_feed() ) {
        $output = "\n";
        foreach ( $attachments as $att_id => $attachment )
            $output .= wp_get_attachment_link($att_id, $size, true) . "\n";
        return $output;
    }

    $itemtag = tag_escape($itemtag);
    $captiontag = tag_escape($captiontag);
    $icontag = tag_escape($icontag);
    $valid_tags = wp_kses_allowed_html( 'post' );
    if ( ! isset( $valid_tags[ $itemtag ] ) )
        $itemtag = 'dl';
    if ( ! isset( $valid_tags[ $captiontag ] ) )
        $captiontag = 'dd';
    if ( ! isset( $valid_tags[ $icontag ] ) )
        $icontag = 'dt';

    $columns = intval($columns);
    $itemwidth = $columns > 0 ? floor(100/$columns) : 100;
    $float = is_rtl() ? 'right' : 'left';

    $selector = "gallery-{$instance}";

    $gallery_style = $gallery_div = '';
    if ( apply_filters( 'use_default_gallery_style', true ) )
        $gallery_style = "
        ";
    $size_class = sanitize_html_class( $size );
    $gallery_div = "
";
    $output = apply_filters( 'gallery_style', $gallery_style . "\n\t\t" . $gallery_div );

    $i = 0;
    foreach ( $attachments as $id => $attachment ) {
        if ( ! empty( $attr['link'] ) && 'file' === $attr['link'] )
            $image_output = wp_get_attachment_link( $id, $size, false, false );
        elseif ( ! empty( $attr['link'] ) && 'none' === $attr['link'] )
            $image_output = wp_get_attachment_image( $id, $size, false );
        else
            $image_output = wp_get_attachment_link( $id, $size, true, false );

        $image_meta  = wp_get_attachment_metadata( $id );

        $orientation = '';
        if ( isset( $image_meta['height'], $image_meta['width'] ) )
            $orientation = ( $image_meta['height'] > $image_meta['width'] ) ? 'portrait' : 'landscape';

        $output .= "<{$itemtag} class="gallery-item">";
        $output .= "
            <{$icontag} class="gallery-icon {$orientation}">
                $image_output
            {$icontag}>";
        if ( $captiontag && trim($attachment->post_excerpt) ) {
            $output .= "
                <{$captiontag} class="wp-caption-text gallery-caption">
                " . wptexturize($attachment->post_excerpt) . "
                {$captiontag}>";
        }
        $output .= "{$itemtag}>";
        if ( $columns > 0 && ++$i % $columns == 0 )
            $output .= '
';
    }

    $output .= "
            

        
\n";

    return $output;
}