@xyphoyd
You can map each joypad event to keyboard ones with Poseidon.
Here's a tutorial:
http://obligement.free.fr/articles/manette_usb.php
BTW, it would be great if Amidog released a new version with some small issues an compatibility fixes. (Or if someone could port ePSXe or PCSX...)
M.
PS: I'm a massive FPSE player but couldn't try it on macmini/2.6 yet. Just can't wait