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Open blocks/blocks_imp_recent_topics.php
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You'll have to add block again and you'll see the options

<?php
/***************************************************************************
 *                      blocks_imp_recent_topic.php
 *                          -------------------
 *   begin                : 2007/02/06
 *   copyright            : Mighty Gorgon
 *   website              : http://www.mightygorgon.com
 *   email                :
 *
 ***************************************************************************/

/***************************************************************************
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 ***************************************************************************/

if ( !defined('IN_PHPBB') )
{
    die('Hacking attempt');
}

if(!function_exists(imp_recent_topics_block_func))
{
    function imp_recent_topics_block_func()
    {
        global $template, $cms_config_vars, $block_id, $userdata, $board_config, $db, $phpEx, $var_cache, $lang, $bbcode;
        include_once($phpbb_root_path . 'includes/functions_groups.' . $phpEx);

        $template->_tpldata['recent_topic_row.'] = array();
        //reset($template->_tpldata['recent_topic_row.']);

        $bbcode->allow_html = $html_on;
        $bbcode->allow_bbcode = $bbcode_on;
        $bbcode->allow_smilies = $smilies_on;

        $except_forums = build_exclusion_forums_list();

        $current_time = time();
        $extra = "AND t.topic_time <= $current_time";
        $forum_ids = '';
        if ($cms_config_vars['md_recent_topic_certain_forums'][$block_id] && !empty($cms_config_vars['md_recent_topic_ids'][$block_id]))
        {
            $forum_ids = 'AND t.forum_id IN(' . $cms_config_vars['md_recent_topic_ids'][$block_id] . ')';
        }

        $sql = "SELECT t.topic_id, t.topic_title, t.topic_last_post_id, t.forum_id, p.post_id, p.poster_id, p.post_time, u.user_id, u.username
            FROM " . TOPICS_TABLE . " AS t, " . POSTS_TABLE . " AS p, " . USERS_TABLE . " AS u
            WHERE t.forum_id NOT IN (" . $except_forums . ")
                AND t.topic_status <> 2
                AND p.post_id = t.topic_last_post_id
                AND p.poster_id = u.user_id
                $extra
                $forum_ids
            ORDER BY p.post_time DESC
            LIMIT " . $cms_config_vars['md_num_recent_topics'][$block_id];

        if (!$result1 = $db->sql_query($sql))
        {
            message_die(GENERAL_ERROR, 'Could not query recent topics information', '', __LINE__, __FILE__, $sql);
        }
        $number_recent_topics = $db->sql_numrows($result1);
        $recent_topic_row = array();
        while ($row1 = $db->sql_fetchrow($result1))
        {
            $recent_topic_row[] = $row1;
        }

        if($cms_config_vars['md_recent_topics_style'][$block_id])
        {
            $style_row = 'scroll';
        }
        else
        {
            $style_row = 'static';
        }

        $template->assign_block_vars($style_row, '');

        for ($i = 0; $i < $number_recent_topics; $i++)
        {
            $orig_word = array();
            $replacement_word = array();
            obtain_word_list($orig_word, $replacement_word);

            if ( !empty($orig_word) )
            {
                $recent_topic_row[$i]['topic_title'] = ( !empty($recent_topic_row[$i]['topic_title']) ) ? preg_replace($orig_word, $replacement_word, $recent_topic_row[$i]['topic_title']) : '';
            }
            $recent_topic_row[$i]['username'] = colorize_username($recent_topic_row[$i]['user_id']);
            if ($recent_topic_row[$i]['user_id'] != -1)
            {
                $template->assign_block_vars($style_row . '.recent_topic_row', array(
                    'U_TITLE' => append_sid(VIEWTOPIC_MG . '?' . POST_FORUM_URL . '=' . $recent_topic_row[$i]['forum_id'] . '&amp;' . POST_TOPIC_URL . '=' . $recent_topic_row[$i]['topic_id'] . '&amp;' . POST_POST_URL . '=' . $recent_topic_row[$i]['post_id']) . '#p' .$recent_topic_row[$i]['post_id'],
                    'L_TITLE' => $bbcode->parse($recent_topic_row[$i]['topic_title'], $bbcode_uid, true),
                    'L_BY' => $lang['By'],
                    'L_ON' => $lang['On'],
                    'U_POSTER' => append_sid(PROFILE_MG . '?mode=viewprofile&amp;' . POST_USERS_URL . '=' . $recent_topic_row[$i]['user_id']),
                    'S_POSTER' => $recent_topic_row[$i]['username'],
                    'S_POSTTIME' => create_date2($board_config['default_dateformat'], $recent_topic_row[$i]['post_time'], $board_config['board_timezone'])
                    )
                );
            }
            else
            {
                $template->assign_block_vars($style_row . '.recent_topic_row', array(
                    'U_TITLE' => append_sid(VIEWTOPIC_MG . '?' . POST_FORUM_URL . '=' . $recent_topic_row[$i]['forum_id'] . '&amp;' . POST_TOPIC_URL . '=' . $recent_topic_row[$i]['topic_id'] . '&amp;' . POST_POST_URL . '=' . $recent_topic_row[$i]['post_id']) . '#p' .$recent_topic_row[$i]['post_id'],
                    'L_TITLE' => $bbcode->parse($recent_topic_row[$i]['topic_title'], $bbcode_uid, true),
                    'L_BY' => $lang['By'],
                    'U_POSTER' => append_sid(PROFILE_MG . '?mode=viewprofile&amp;' . POST_USERS_URL . '=' . $recent_topic_row[$i]['user_id']),
                    'S_POSTER' => $recent_topic_row[$i]['post_username'],
                    'S_POSTTIME' => create_date2($board_config['default_dateformat'], $recent_topic_row[$i]['post_time'], $board_config['board_timezone'])
                    )
                );
            }
        }
    }
}

imp_recent_topics_block_func();

?>

<?php
/***************************************************************************
 *                       blocks_imp_recent_topics.cfg
 *                            -------------------
 *   begin                : 2007/02/06
 *   copyright            : Mighty Gorgon
 *   website              : http://www.mightygorgon.com
 *   email                :
 *
 ***************************************************************************/

/***************************************************************************
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 ***************************************************************************/

if ( !defined('IN_PHPBB') )
{
    die('Hacking attempt');
}

// array( <Field label>, <Field Info>, <Config Name>, <Options>, <Field Values>, <Control Type>, <Block>, <Default Value>);

$block_variables = array(
    array('Number of recent topics', 'number of topics displayed', 'md_num_recent_topics', '', '', '1', 'recent_topics', '10'),
       array('Recent Topics Style', 'choose static display or scrolling display', 'md_recent_topics_style', 'Scroll,Static', '1,0', '3', 'recent_topics', '1'),
    array('Recent Topics from certain forums', 'choose if recent topics will be only from a restricted ids', 'md_recent_topic_certain_forums', 'Yes,No', '1,0', '3', 'recent_topics', '0'),
    array('Recent Topics IDs', 'Specify forum IDs to display recent topics', 'md_recent_topic_ids', '', '', '1', 'recent_topics', '')
);

$block_count_variables = count($block_variables);

?>