He are not using Bodnar board, but low cost Arduino PRO Micro + MMJoy2 firmware, because this Cougar has their PCB electronics "bricked.

Anyway for most simmers keyboard emulation needs, free/shareware like Joy2Key, SVMapper, Joystick Gremlin... is enough, specially in DCSW with their customization of controls, profiles per plane and modifiers and switches (modes).