This is something I'm actively working on. These controllers generally work by sending volume up and down (generally media controls) to apps who intercept them. It is my understanding that Apple reject apps that make use of this functionality where not intended (intended generally means a media player app). In the past Apple have rejected camera apps that use volume up to take pictures. Now it seems to be more lenient.
Since Apple won't answer my enquiries about whether they'd reject Marvin if I do this, I'm planning a "try my luck" update some time soon.
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