Wow, I had no idea Steam could launch non-steam apps!
I use DS4Win but I vastly prefer Steam control config.
yes! i even used it to map my Guitar Hero controller (although i think that also needed WiiHID as a driver) to play games like the Soulsborne series on the GH controller and it worked better than JoyToKey or other softwares in a lot of cases!
pretty much every time a game like this doesnt work with my gamepad if i add it as a non-Steam game and launch it in Big Picture it works