Are you here and work for new version of mod? Because I have some more suggestions.
Yeah, but I normally have multiple mods going at once and only have so muc time, so I can't give a release date for any updates. They get done as my time and interest permits.
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As diseases you also can add nipah virus (from bats), other zoonotic diseases, parasitic worms (not as vermins, only as syndromes). And even, but this may be not in setting, special diseases from Plague Inc - necroa (new, contagious type of zombies), neurax worm (are disease and spread like disease, but also exist vermins who bite your creatures and start this syndrome), Nox Eternis (disease that can rare produce vampires) and disease inspired by simian flue (can transform animals into animal people, for normal sentients is just disease).
For diseases spreading you can make some materials and syndromes that give material emission. Ways of spreading possible to give different forms of disease (lung form, stomac form, skin form, blood form etc).
I am still thinking about the drugs. I am not sure I will adding any relaxing type of drugs as I have always seen the goblins as a frantic and violent group. I will probably give them drugs that increase movement, combat ability, reduce the need to eat and sleep, etc. They will have have downsides to them though. I could use some venoms for it.
I do really like the idea of adding more diseases for the goblins. They have always been a disgusting and vile war torn race of brutal savages from my view of them. I will definitely use some of those ideas and I do like the material emission idea. That would help spread them.
Diseases will work not only for goblins. Vanilla goblins even have no fevers. But other races playing will be more fun with diseases (dwarves and humans have soap, but elves are fully in FUN).
Your vision of goblins may be more grotesque than needed. In vanilla goblins have taverns, markets, performers, even rare libraries. They are different, but civ, not a hive of warmachines. So why they cannot have some hallucinogenic drugs? Stimulators is good, but exist not only stimulators.
Also drugs can have effects not only fo war, but combinations of war and non-war(relaxing or disadvantage) effects. Like even hemp, that can be as painkiller and turn stress vulnerability to low, but give immoderation and dizziness. And erratic behavior, that in current version provide more fights.
Venoms can be hallucinogenic, even wasp venom is small psychedelic. But smoking gas in training ground for special effect will work faster. So you can add hookah.