"God Mode" (F5) and External view (F3) are quite different. God Mode (=CM Eye) allows you to "fly" around without plane. Online, its only enabled in the SEA for certain events (KOTH for example, i dont know about the rest).
All you need to do is follow the instructions in Fuzemans link and map the respective functions to keyboard or Joystick.
I myself have mapped then in mode3 on my stick, for easier use.
Then, in tower, just hit F5 and then use the assignes keys/buttons to move around. You can "turn around" with your stick x/y and rudder axis. Your throttle setting will determine the *speed* at wich you move at (full throttle is VERY fast).
Autopilot, unless you have them mapped manually that way, your keys do not work.