In arena settings, enable "Tower God's Eye View" to allow you to get into God Mode when you're ready.
Mapping the CM Eye Move functions can be done to any joystick button you want, but to change control modes, I find you need to use the keyboard.
1) Go into Options > Controls > Map Controllers
2) Open the Mode Selection menu, select 'Mode 4' (I don't ever use mode 4 for anything else)
3) Hit the 'Copy Mode 1' button
4) Select a joystick button, set to 'View CM Eye Move Forward'
5) Select a joystick button, set to 'View CM Eye Move Backward'
6) Select a joystick button, set to 'View CM Eye Move Map'(optional)
7) Go to 'Map Keys' and set an available key to select Mode 4. (I set mine to the * on the keypad)
There are other keys you can use, but be careful not to reset one that you use for something else. A "that button is in use. Do you want to remap it" message will pop up if the button you wish to use is already in use.
CM Eye should now work.
Hit F5 from the Tower, then your key to enter Mode 4.
The combination of using your joysticks buttons, your joystick and rudder movements, and your throttle, will move you around in CM Eye. It does take some time getting used to using it..
Your joystick controls pitch and roll.
Your rudder controls yaw.
Your throttle controls how fast you move.
If you don't want to move forward or backward, just have your throttle closed - you still need to use your CM Eye Move button to make the view do anything.