Yep, definitely -2 AXIS, i tried to take a pic put it kept crashing. If i try to configure the buttons when the pad's connected via the wireless adapter all directions and both triggers change to that. Here's the defaults on the test program.
I've had a few issues via wireless in the past, but mostly they're sorted now, it's probably fine with 80%+ of games I reckon. The most common issue was that it would always pull the left analogue left, but on Polymaniacs it likes to accelerate.
Cheers!