Build a ship with a dock wich has a push or pull effect-gun (i used 50%gun slave and 100% effect slave).
Push gun:
Controlling the gun manually will aply the force vector normaly. When uisng a logic clock on the main entity the force vector will be aplyed normaly while the player is in build mode but will only aply a movement without rotation while in flight mode.
Pull gun:
the pull gun will allways move the ship without rotation.