I don't know what version of UAE you're using (0.#.## or *nix, Windows, Mac), but I think Desolator was talking about the "Input" tab on the WinUAE "Properties" window. Here you can map any buttons/axis on a DirectX compliant joystick/pad to any Amiga keyboard key, mouse button/axis, or joystick/pad button/axis (incl. the CD32 pad). I'm using WinUAE 0.8.22 R2, but I seem to recall this particular tab in 0.8.14. I could be wrong though...