dirtystylus/wp-remove-text-tab-buttons

## wp-remove-text-tab-buttons
function _remove_quicktags( $qtInit )
{
    // Remove only the 'italic', 'bold', and 'block-quote' buttons
    $remove_these = array('strong', 'em', 'block', 'link', 'del', 'ins', 'img', 'ul', 'ol', 'li', 'code', 'more', 'close');
    // Convert string to array
    $buttons = explode(',', $qtInit['buttons']);
    // Loop over items to remove and unset them from the buttons
    for( $i=0; $i < count($remove_these); $i++ )
    {
        if( ($key = array_search($remove_these[$i], $buttons)) !== false)
            unset($buttons[$key]);
    }
    // Convert new buttons array back into a comma-separated string
    $qtInit['buttons'] = implode(',', $buttons);
    return $qtInit;
}
add_filter('quicktags_settings', '_remove_quicktags', 10, 1);