Please find attached a beta version of the FSUIPC6.dll anf the FSUIPC7.exe that has native support for HID joystick type devices with up to 128 buttons.
For FSUIPV6. this is a dll-only release - to use, download the dll and drop it into your FSUIPC6 installation folder.
For FSUIPC7, it is an exe release only - to use, download the FSUIPC7.exe and drop it into your FSUIPC7 installation folder.
Buttons 0-31 are recognised as usual. Buttons 32 onwards will be recognised as buttons 132, 133