Can't wait till there are speaking excercises for Gaelic!!
Correct pronunciation is essential in any language, but particularly in Gaelic--so I'll be thrilled when speaking exercises are available for Scottish Gaelic!!
It's not something that the developers or the contributors would create. It requires complicated programming with lots of training in sound recognition and comparisons. I'm pretty sure the developers have purchased voice-recognition software that they use for the courses that do have speaking exercises. So maybe if some company out there developed Gaelic voice-recognition software, they might be willing to use it. Or it may be that all of their voice-recognition and comparison software is provided by one company and it has to be that specific company that would need to put in the time and effort of developing the needed software. Endangered languages with a smaller interest base are a particular interest of Duolingo, but they may not be profitable enough for the speech-recognition company.