Agreed. All these hard menu joystick binding need to be made remappable from the game menu.
Did you check Documents\STAR WARS Squadrons\settings\ProfileOptions_profile_synced if you can change the binding there?
By the way, your Z-axis may not be broken. For some reason the game likes to uncalibrate the Z-axis (usually when it's not centered during loading screens). Unplugging and replugging the HOTAS usually fixes it for me for a while (it's only Squadrons that messes it up - but when it does it's messed up everywhere until you replug it, not even a reboot will help, but unplugging and replugging the USB will usdually fix it - sometimes it takes two unplugs - you can also do so while the game is running if it occurs intermediately).
