Robotic limbs with different abilities

[GORE]

How about a special borg-head?

Instead of using an upgrade slot for the propulsion upgrade - this special head would allow the borg to seperate their head from their body and fly away with small boosters fitted right to it. That mechanism would potentially allow to allow a damaged or ambushed borg to get away to safety or safe on the propulsion upgrade - in case of being trapped in outer space; giving room to another type of upgrade.