Callbacks execution in queue

Hi Isomorphic,
I have question how are callbacks handled when using queue. Imagine following scenario:

1. start queue
2. call DS1.validateData with DSCallback1
3. call DS2.validateData with DSCallback2
4. send queue with RPCQueueCallback

For sure RPCQueueCallback gets executed with all responses. But is there a way how to get executed also DSCallbacks for every separate DSRequest which was send inside the queue?