Reddit reviews 3.5mm Stereo Headset Hands-free Adapter/ Adaptor with Microphone and Control Button for Apple iPhone 4/ 3GS/ 3G S/ 3G, iTouch iPod Touch I II II IV 1 2 3 4 2nd 3rd 4th Generation
We found 1 Reddit comments about 3.5mm Stereo Headset Hands-free Adapter/ Adaptor with Microphone and Control Button for Apple iPhone 4/ 3GS/ 3G S/ 3G, iTouch iPod Touch I II II IV 1 2 3 4 2nd 3rd 4th Generation. Here are the top ones, ranked by their Reddit score.
This would be a possible solution for now: http://www.amazon.com/Headset-Hands-free-Adapter-Microphone-Generation/dp/B000YE35I6/ref=sr_1_3?ie=UTF8&qid=1457984532&sr=8-3&keywords=headset+mute+switch
Are you able to remap any of the controller buttons in the settings? Are you able to modify any of the config files?
It's a pretty specific issue. The devs may address it in the future, but I'm sure they're busy with other pertinent issues. You may just need to find your own solution for now.