Microsoft had a press release and mentioned that it would be usb but not work on the pc, so wow, howed you get it to work at all? Wheres this driver you used?
also: I don't really know about that, But Seeing at it wasnt intended for pc usage its probably the controller.
Also, Those triggers arent buttons, They're pressure sensitive, I think I counted 3 levels of sensitivity on each, so It's not like you could program it to be a button, It doesnt work like a button.