I've pretty much finalized my HOTAS keymapping for the IL2 Bf 109s. (slways subject to tweaking)
Printouts available below.
IL2 reads the right joystick as joystick 0. It reads the FCS throttle as joystick 1. The same would probably apply if you used a second actual joystick instead of the throttle.
Also.. IL2 reads all the button one less than normal. Our button one, the firing trigger is button 0 to them. All other buttons are one less than normal too when setting things up.I have them displayed IL2 style on the images for reference.
Teach these new disciples to obey all the commands I have given you, and be sure of this, I will be with you always even unto the end of the age. Mathew 28:20