You can try this..

mix the downloads
Credit to jomasco

Open funcs.php file and search for:
PHP Code: 
foreach($_POST['ad'] as $addKey => $addVal) { 
before add:
PHP Code: 
shuffle($_POST['ad']); 
Search for and comment:
PHP Code: 
$get = "SELECT id,sid,title,type,url FROM wcddl_queue ORDER BY id ASC LIMIT 0, 250"; 
Add above:
PHP Code: 
$get= "SELECT q.id,q.sid,q.title,q.type,q.url FROM wcddl_queue q LEFT JOIN wcddl_sites s ON (s.id = q.sid) ORDER BY s.rating, s.id ASC LIMIT 0,".($this->limit * 4)."";