[{HVY-E}Jinxx]

You need to manually edit your conf.ini file.
The settings you are looking for are 1RX, 1RY and 1RZ Those are the toe brakes and the rudder.

Here is part of my rts joystick section for reference.

[rts_joystick]
X=0 1 4 9 16 25 36 49 64 81 100 0
Y=0 1 4 9 16 25 36 49 64 81 100 0
Z=0 10 20 30 40 50 60 70 80 90 100
RZ=0 10 20 30 40 50 60 70 80 90 100 0
FF=0
U=0 10 20 30 40 50 60 70 80 90 100 0
V=0 10 20 30 40 50 60 70 80 90 100 0
1U=2 100 100 100 100 100 100 100 100 100 100 0
1RZ=0 20 29 38 47 56 64 73 82 91 100 0 Rudder
1Y=0 12 20 28 37 45 53 61 70 78 86 0
1X=0 20 31 42 52 63 74 85 95 106 117 0
1RX=0 100 100 100 100 100 100 100 100 100 100 0 Right Toe Brake
1RY=0 0 0 0 0 0 0 0 0 0 0 0 Left Toe Brake
1Y1=0 10 20 30 40 50 60 70 80 90 100 0
1Z1=3 15 25 35 45 55 65 75 85 95 105 4
1Z=2 100 100 100 100 100 100 100 100 100 100 0
1V=0 100 100 100 100 100 100 100 100 100 100 0 0
1X1=0 100 100 100 100 100 100 100 100 100 100 0 0

As far as IL-2 only seeing 4 devices...... You are only partially correct. You can manually edit the conf.ini file to add more devices if necessary. I currently have 2 Thrustmaster HOTAS Cougars installed w/ CH Pro Rudders.

You may also have to make sure that your HOTAS rudder is disabled. (Haven't gotten my Warthog yet, so I'm unsure on this).
Recommend you try using IL-2 Joy Control if you still have issues getting the rudder to work. That way you can at least make sure that the proper entries are being made in your conf.ini file.

S!