It’s quite simple, unlike 3.2.1 there are no filters called ‘enable_update_services_configuration’ in 2.9.2.

3.2.1:

grep -R -n 'enable_update_services_configuration' *
wp-admin/options-writing.php:154:<?php if ( apply_filters( 'enable_update_services_configuration', true ) ) { ?>
wp-content/plugins/enable-site-ping-wpmu/enable_ping_wpmu.php:15:	remove_filter('enable_update_services_configuration', '_do_return_false');
wp-content/plugins/enable-site-ping-wpmu/enable_ping_wpmu.php:16:	add_filter( 'enable_update_services_configuration', '_do_return_true' );
wp-includes/ms-default-filters.php:55:add_filter( 'enable_update_services_configuration', '__return_false' );

2.9.2:

grep -R -n 'enable_update_services_configuration' *
wp-content/plugins/enable-site-ping-wpmu/enable_ping_wpmu.php:15:	remove_filter('enable_update_services_configuration', '_do_return_false');
wp-content/plugins/enable-site-ping-wpmu/enable_ping_wpmu.php:16:	add_filter( 'enable_update_services_configuration', '_do_return_true' );

Haven’t found any solution yet, though I’ll try to remember to write when I find one.
(Please no debate regarding old versions of WordPress.)