Those are definitely interesting and I would like to get to them in the future but not priority. For chemical and biological warfare it will either be abstracted or changed to a fictional system as I don't plan on making irl designers for those.
Sounds reasonable, could perhaps just allow you to choose between some pre-made existing diseases/chemical agents, or more abstract designed ones. IE deployment method, affected systems, density and stuff. Overall I just like my hostile landscapes and potentially backfiring weapons.
