Syndicate Drone: A Pacifist Antagonist.

[warcrimes]

Add a new category of Side-Antagonists. For the annoying things that are still (mostly) harmless.

They make the floors wet and don't put up a sign

They turn off the securitrons

They steal all the candy in the vending machine 

They are the unseen terror of the station. The Wraith Drones

There we go, that's the direction to take there powers in. Annoyance

Give them dispenser for wetting and space lubing the floors
A syringe to inject food with stuff that makes you sick and puke
A N20 gas canister for creating clouds of sleep gas

Basically, a science gremlin. You don't know if they messed with your stuff because they're too sneaky to be seen, but you're gonna blame them for anything that went wrong.

I have to agree with this direction. Rather than making them sinister syndicate spies, have them be more or less defective / mischievous drones. Small chance when a player becomes a drone to spawn without the laws, and with the aforementioned annoyance tools instead of useful ones. 
Keep some sort of objectives like poisoning x number of foodstuffs, emptying all the coffee machines, lubing X many floor tiles, etc- but keep them as a miscreant rather than a full blown antag. That way people won't be smashing every drone they find, and even when you do notice one being an asshat, it's not necessarily something to kill.