When can you add a hyper-aggressive alien i can inserter-throw into space

i've done both of these things, for the turrets i wire a circuit that recognises the ammo decreased below the auto insertion limit (the amount of ammo that sits in the turret from the inserter), this fed into a latch/memory cell circuit that held the desired state for 5 seconds. it needs this ...

Hah, brilliant!

In the secret settings menu there's an... ominous setting. Does anyone know what it does