Well it don't matter if it is threads or posts.
What you will need to do is open the file, modcp/moderate.php
In that file find the following:
PHP Code:
$moderated = $db->query_read("
SELECT *
FROM " . TABLE_PREFIX . "moderation
WHERE type IN ('thread', 'reply')
");
And change it to this:
PHP Code:
$moderated = $db->query_read("
SELECT *
FROM " . TABLE_PREFIX . "moderation
WHERE type IN ('thread', 'reply')
LIMIT 100
");
That will limit the page to 100 results.