"Special Field Type" to group fields?

Of course, I'm using "Meta Box Group" to group different fields. It works well so far.

array(
    'id'          => 'my_content',
    'collapsible' => true,
    'group_title' => 'My Content',
    'type'        => 'group',
    'fields' => array(
        array(
            'id'   => 'title',
            'name' => 'Title',
            'type' => 'text',
        ),
        array(
            'id'   => 'subtitle',
            'name' => 'Subtitle',
            'type' => 'textarea',
        ),
        array(
            'id'   => 'image',
            'name' => 'Image',
            'type' => 'image',
        ),
        array(
            'id'   => 'content',
            'name' => 'Content',
            'type' => 'wysiwyg',
        ),
    ),
),

But I'd like to use "Meta Box Group" for specific tasks - such like collapsible, cloneable, sortable...

Could it be nice having a field type (only) for grouping different custom fields? That way, it'll help reducing server load.

Thanks again Tran!

Hi Tran...

Not grouping fields via UI.

Grouping fields (each field) under one special field. Under one roof.

- main_id
    * text_field_id
    * image_field_id
    * slider_field_id
    * time_field_id
    ...

That way, it'd a lot easier when naming all IDs.
And also, the dev just needs to focus on (main_id) when getting value.

For example,

/* Post Meta Box */

add_filter('rwmb_meta_boxes', 'set_post_meta_box');
function set_post_meta_box($meta_boxes) {
    $meta_boxes[] = array(
        'id'         => 'post_meta_box',
        'post_types' => 'post',
        'tab_style'  => 'left',
        'tabs'       => array(
            'box_1_tab' => 'Box 1',
            'box_2_tab' => 'Box 2',
        ),
        'title'      => 'Post Meta Box',
        'fields'     => array(

            /* Box 1 */

            array(
                'id'     => 'box_1',
                'tab'    => 'box_1_tab',
                'type'   => 'special_fieldset',
                'fields' => array(
                    array(
                        'id'   => 'title',
                        'name' => 'Title',
                        'type' => 'text',
                    ),
                    array(
                        'id'   => 'description',
                        'name' => 'Description',
                        'type' => 'textarea',
                    ),
                ),
            ),

            /* Box 2 */

            array(
                'id'     => 'box_2',
                'tab'    => 'box_2_tab',
                'type'   => 'special_fieldset',
                'fields' => array(
                    array(
                        'id'   => 'title', // Same ID from Box 1
                        'name' => 'Title',
                        'type' => 'text',
                    ),
                    array(
                        'id'   => 'description', // Same ID from Box 1
                        'name' => 'Description',
                        'type' => 'textarea',
                    ),
                ),
            ),
        ),
    );
    return $meta_boxes;
}

To return values...

$box_1             = rwmb_meta('box_1');
$box_1_title       = $box_1['title'];
$box_1_description = $box_1['description'];

$box_2             = rwmb_meta('box_2');
$box_2_title       = $box_2['title'];
$box_2_description = $box_2['description'];

Without defining long ID names for each field,
the dev can return values for Title and Description just using box_1 and box_2 IDs.