ReceiverLink Async versions of Complete/Modify/Accept/Reject/Release?

Just curious why there aren't Async versions of acknowledgements back to the broker - I see that calling Complete or Accept/Reject/Release/Modify on the ReceiverLink all return void and run synchronously - but I would think since its sending an acknowledgement back to the broker that it would be I/O driven and therefore should have an async option, no? It feels strange that you can async read messages from the receiver link but you can only respond to them synchronously....

Are there any plans for adding async versions of these responses?