Not use frontend supermodel UI
Run the emulator from the command line . Enter, Supermodel.exe -input-system=xinput -config-inputs
After setting the buttons on the xbox controller, start the game by entering eg Supermodel.exe lemans24.zip -input-system=xinput for xinput controller
if I'm not mistaken, such games have been added to the file games.xml https://www.supermodel3.com/Forum/viewtopic.php?f=3&t=1138&start=1600
Emergency Call Ambulance (Japan)
Fighting Vipers 2 (Original)
Star Wars Trilogy Arcade (Prototype 16.9.1998)
Virtual On 2: Oratorio Tangram (Original)