Bueno, he encontrado una solución a la paginación en los topics:
http://www.simplemachines.org/community/index.php?topic=203647.msg1294800#msg1294800Tan sólo deberás de modificar el archivo /Sources/QueryString.php:
Buscamos esta línea:// This should work even in 4.2.x, just not CGI without cgi.fix_pathinfo.
if (!empty($modSettings['queryless_urls']) && (!$context['server']['is_cgi'] || @ini_get('cgi.fix_pathinfo') == 1) && $context['server']['is_apache'])
{
// Let's do something special for session ids!
if (defined('SID') && SID != '')
$buffer = preg_replace('/"' . preg_quote($scripturl, '/') . '\?(?:' . SID . ';)((?:board|topic)=[^#"]+?)(#[^"]*?)?"/e', "'\"' . \$scripturl . '/' . strtr('\$1', '&;=', '//,') . '.html?' . SID . '\$2\"'", $buffer);
else
$buffer = preg_replace('/"' . preg_quote($scripturl, '/') . '\?((?:board|topic)=[^#"]+?)(#[^"]*?)?"/e', "'\"' . \$scripturl . '/' . strtr('\$1', '&;=', '//,') . '.html\$2\"'", $buffer);
}
Y la reemplazamos por esta:// This should work even in 4.2.x, just not CGI without cgi.fix_pathinfo.
//if (!empty($modSettings['queryless_urls']) && (!$context['server']['is_cgi'] || @ini_get('cgi.fix_pathinfo') == 1) && $context['server']['is_apache'])
//{
// Let's do something special for session ids!
if (defined('SID') && SID != '')
$buffer = preg_replace('/"' . preg_quote($scripturl, '/') . '\?(?:' . SID . ';)((?:board|topic)=[^#"]+?)(#[^"]*?)?"/e', "'\"' . \$scripturl . '/' . strtr('\$1', '&;=', '//,') . '.html?' . SID . '\$2\"'", $buffer);
else
$buffer = preg_replace('/"' . preg_quote($scripturl, '/') . '\?((?:board|topic)=[^#"]+?)(#[^"]*?)?"/e', "'\"' . \$scripturl . '/' . strtr('\$1', '&;=', '//,') . '.html\$2\"'", $buffer);
//}