This question has been answered by breezer. See the first response.

// add doc ids where the content field will appear
$valid = array( '28', '29', '30' );
if( !in_array( $id, $valid ) ){
mm_hideFields( 'content' );
}
mm_createTab('Slider', 'slider', '', '3', '<p>Add sliders here:</p>', '650');
mm_moveFieldsToTab('slider-img-01', 'slider');
mm_moveFieldsToTab('slider-img-02', 'slider');
mm_moveFieldsToTab('slider-img-03', 'slider');
etc..