Anyone set it to more than 1000 results? I'm not sure what it means by:

"Second, there's also a 3rd argument to SetLimits() API call that also defaults to 1000 and must be raised. (With SphinxSE, use "maxmatches" option.)"

Is it something IPB has to implement?

http://sphinxsearch.com/info/faq/#max-matches

I know a lot use Sphinx, please reply if you know. :)

You can set Sphinx to display more result , however IPB depends on it's own setting on how may results are displayed. The setting is within Admin > Settings > Search Settings and currently max results are set to 1000

In addition to the sphinxapi.php and sphinx.conf file, the core IPB that needs to be modified is in /admin/applications/forums/extensions/search/engines/sphinx.php

return array( 'count' => intval( $result['total_found'] ) > 1000 ? 1000 : $result['total_found'], 'resultSet' => $search_ids );

Hope this is helpful to others wanting to accomplish the same.

been meaning to re-impment it. this was a good reminder lol