on line 70 of wp-admin/edit-comments.php delete teh following code
$comments = $wpdb->get_results("SELECT * FROM $wpdb->comments WHERE comment_approved = "0" OR comment_approved = "1" ORDER BY comment_date DESC LIMIT $offset,20");
and replace with
$numcomms = $wpdb->get_var("SELECT COUNT(*) FROM $wpdb->comments WHERE comment_approved = "1"");
if (0 < $numcomms) $numcomms = number_format($numcomms);
$comments = $wpdb->get_results("SELECT * FROM $wpdb->comments WHERE comment_approved = "0" OR comment_approved = "1" ORDER BY comment_date DESC LIMIT $offset,$numcomms");
This, however, does not page the comments, so if you ahve a huge comments table, you might try other means….
DEVELOPERS…is there another way to access previous commetns other than the previous 20 or to page the results?