Allows you to assign (physical) controller keystrokes and joystick movement directions to (emulated) keyboard keys

[Korb]

This way, you can select keyboard controls in the game settings, but play using a controller. This will also be useful in cases where the game has support for the Sinclair I/II or Fuller joystick, but does not have Kempston, or when trying to play with a controller in a game that uses exclusively or primarily the keyboard.

Kempston / Interface1 Player1 / Interface1 Player2 down-down list at Detected game controllers window

Joystick Preferences window of ZX-Poly 2.3.4 (Dec 7, 2024)