Dual Shock 4 (DS4) iOS 12 full support (request)

Hi everyone. While in iOS 13 you have full native DS4 support, and so RetroArch recognizes all the buttons of the gamepad (including start and select). In iOS 12 and previous versions of iOS there is no native support for the DS4, making it necessary to recurre to Ncontrol or Bstack with C4all, which work ok but the issue with this way is that start, select, home button, L3 and R3, are not recognized in RetroArch. It would be great if there is a way to change this and make the DS4 be fully recognized in IOS12 and previous versions with btstack, c4all or Ncontrol. Thanks in advance