I am also having trouble with this joystick in BF4. Some of the buttons register as weird things (like pad up and pad left), although this doesn't seem to have an effect on the function of the stick. What does have an effect is that throttle up and throttle down register as "trigger 1" and "trigger 2" respectively; I don't think the plane throttles properly because of this; furthermore, directional control becomes completely unresponsive when the throttle is set to below about 50%. This makes certain kinds of attacks (like strafing!) completely impossible, and the planes more-or-less unflyable.
Will we actually get a response from anyone at EA in this forum, or is this just a customer supplied "knowledge base"?