Pushing Tickets in queue the "pusher" is not a member of?

Hello there,

I'm using RT 4.2.8. I'm having several queues for several departments.

Now, tickets have to be pushed into other queues where then the 
according department works on them. But the "pusher" should not be a 
member of the queue, and he should not even see the queue.

Now I'm not getting anywhere with this. How do I systematically enable 
users to push tickets in queues in which they are no members, and which 
they don't need to see?

Thanks for any advice.

Regards, Patrick
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