voceconnect/post-selection-ui — pull request #3 by matstars (2014-03-06 14:13:23+00:00)
Title: add filter post_selection_ui_render_results_args to allow for filtering 

If I wanted to, for example, only allow parents to be connected via o2o, this filter would allow this via:

add_filter('post_selection_ui_render_results_args', function( $query ){
$query['post_parent'] = 0;
return $query;
});