I think this is honestly a big one, I saw you guys support key mapping on your own controllers why not add this to 3rd party controllers? I get it you want to sell your controllers to the mass and give people a reason to purchase them over cheaper alternatives but I simply don't like the layout of the controllers you guys are offering. I couldn't find a single controller that is more comfortable and perfect for my hands than my Ipega 9023.
Adding that feature into your overlay would be a HUGE deal as people without root are usually stuck using highly sus software like the octopus overlay which is borderline just installing spyware on your phone.