Threaded comments pager ajaxified
install views module and create a new view with comments as base, block as output, and the actual node as context.
set it to use ajax, et voilà.

then - add this block to the content section and limit its visibilty to the corresponding content type.

to make sure the JS of views is added you have to add them manually. so in you template.php - add
function YOURTHEME_preprocess_page(&amp;$vars, $hook) {
//Reload the javascript into the scripts. $vars['scripts'] = drupal_get_js(); } - may be even better to check the $vars if you're on the desired content type