First open the defaults.ini file in the main dir with notepad and change developer_mode = 0 to developer_mode = 1. Then go to the /configs folder and add these lines to the default.ini file - under the cheat key section (down at the bottom):

[icPlayerPilot.DevIndestructable]
Keyboard, I, CTRL, ALT

[icPlayerPilot.DevKillCurrentTarget]
Keyboard, X, CTRL, ALT

[icPlayerPilot.DevJumpToCurrentTarget]
Keyboard, G, CTRL, ALT

[icPlayerPilot.DevDamageSelf]
Keyboard, K, CTRL, ALT

Hit the corresponding 3 keys to do what it says.