Thank you for your comment NomDash!
For the moment, as Input Madness is free, we didn't put much effort on this kind of features, unfortunatly. (as we didn't do playtest either haha)
But, if players backed us, and if we find time, you'll be able to use these controllers, as I've made note of your issue for our future updates!
I guess only xbox controllers works for now 🤷♀️
Cheers!