UFO Mod 1.1
MOD UFO Mod 1.1 for GTA 5 will allow you to manage a huge flying saucer, equipped with an arsenal of high-tech alien weapons.

F11-show or hide the menu.
Num-0 previous menu.
E-enter and exit the UFO.
U-call UFOs.
W, A, S, D-move the UFO.
Shift-up.
CTRL-down.
LMB (Left Mouse Button)-shoot.
The RMB (Right Mouse Button)-aiming.
Space-shoot from the cannon.
F-steal man.
(V)-to change the camera.
Tab-change the speed.

Source:
UFO Mod 1.1