- (OPTIONAL) From time to time they need to recharge their batteries. Recharger like cyborgs, or finding new power cells (their hearts?). Being half machine and half human, they should be able to do the surgery on themselves (just ID-Crowbar-powercell-crowbar-ID)
They already replaced the hunger in machine people with the need to feed on power. You click with a grab-intent to sap power from APCS for food. Can't see much point in changing it now.
I'd like to maybe see more customization options for the machine people, like a colour picker for your screen or status emotes like the AI has.