Queues which you create via the Swiftlet API are system queues. Regular queues are create via the management tree only (CLI "new").
System queues in turn are created and managed by their corresponding queue controller. If enable the queue manager trace space, you should see which queue controller is used to create the queue. It is picked by a matching queue name with queue controller predicate top-down the queue controllers. The last one with predicate "%" matched for all.
You might use this last one or, if you really need different settings, create your own queue controller with matches with your queue name:
http://www.swiftmq.com/products/router/swiftlets/sys_queuemanager/controller/index.html 
