Add bulk generate URL alias via pathauto function
If you have access to your own module you can add a hook_cron function with the following code. On each cron it will execute the bulk generation for nodes
<?php
function feed_control_cron(){
    
    //If you want to change the number of nodes to change
    variable_set('pathauto_max_bulk_update', 1000);
    
    //include the .inc files of pathauto
    _pathauto_include();
    //Executes the generation of URL aliases for nodes
    node_pathauto_bulkupdate();
}
?>Other solutions: http://drupal.org/node/236304
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