Yes, i'm using PPJoy with WinUAE and it works perfectly!
The closest to the real thing in playing AMIGA games :-)
In the WinUAE configuration, on the Input tab, don't forget to select the paralel joystick (it is displayed has LPT1:Amiga 4 Player Joystick 1 if using the parallel port 1)
Select also Configuration #1 (for example) instead of Compatibility mode.
The Game and I/O Ports tab is not of any use.
BTW: Unfortunably, I was on the the many who didn't drop a line thanking the author :-(
Oops