better tinker poison/disease?

[Sirrocco]

Poison Groove and Viral Injector (poison and blight/disease weapon-attach tinkers) both have descriptions that imply that there are better ways to do the thign they're doing. Does anyone know what they're talking about? Are there recipes for better poison/disease attachments out there somehow? Adding more therapeutics skill and/or increasing available tier doesn't change the quote.

[Frumple]

There's a few other tinkers that use poison (toxic canister) or disease (needlegun, toxin shell) it could be referring to, but that's about it, so far as I'm aware. Fluff text's probably just fluff, or at most a hook for later tinker additions. Maybe a reference to the alchemist's helper tinker, I'unno. Half-hearted poke around the code isn't really showing anything unusual.