the last thing a tanker, or any other intelligent combatant would do is turn his power off, thereby disabling himself intentionally in battle. Ive seen alot of players turn their engines off/on at certain instances in dogfights, apparently to gain some sort of angles advantage. Im seriously doubting that any combat pilot intentionally turned his engine on and off to cut some 3D corner in air combat. If there is a recorded instance of it ,I would love to read it.