Heres the method I post on the KOTH Arena Message. KOTH does enable CM Eye mode.
You may have to set up CM-Eye for it to work, here's how.
There are a few ways of course but it is easier to set up
a 'Mode 3' and use your joystick buttons and throttle.
1) Go into Options > Controls > Map Controlers
2) Open the Mode Selection menu, select 'Mode 3'
3) Hit the 'Copy Mode 1' button
4) Select Button 0, set to 'View CM Eye Move Forward'
5) Select Button 1, set to 'View CM Eye Move Backward'
6) Select Button 2, set to 'View CM Eye Move Map'(optional)
7) Go to Map Keys and set an available key to select Mode 3.
I personally set it to the * on the keypad.
There are other choices you can use however.
CM Eye should now work.
Hit F5 from the Tower, then your key to enter Mode 3.
Joystick buttons 0, 1 and 2 will move you around in CM Eye.
Your throttle controls how fast you move.