I did have a look at ps3 joystick issue... their behavior is even worst than cheap chinese joystick: they don't report number of axis, button and hat, hat is not really a hat (it's handled as ... button
) and moreover it flood SDL with events
All UAE4ALL do have such problem, workarounds are possible anyway...
EDIT: even worst, the first button are not the simple one you would expect but it's select, I think the guy who design this controller was drunk
0 to 3 are select, L3, R3, start
4 to 7 are up, right, down, left
8 to 11 are L2, R2, L1, R1
12 to 15 are /\, O, X, 
16 is Home button
I didn't see any way in guichan menu to customize joystick... that's sad because for such crap it would be usefull...