Planned Features: (not in order)
Nerve Gas(Done), Chemical Detection Kits (Done) and Antidote Kits (Done)

Gas shells for Gredwitch addons (if possible, but likely not practical), Ferret rounds (gas canisters that breach thin barricades) (scrapped, other people can do it, I won't)

possible merging with JMOD (rejected, JMOD has a very different design philosophy so that keeping GChem optional is the best option, however, a tear gas grenade has been contributed to JMOD)

Possible Features:
Rewrite gas and exposure code (unsure, may revisit gchem eventually, may just make a GChem 2.0)
Addon-Native Gas Mask and Chemical Suit protect against more than GChem Gas
Pepper spray, adamsite and lewisite (unlikely, proven to be considerably difficult to add new agents)

Unlikely Features:
Mixing Gases (particle effects don't lend themselves well to a highly custom feature like this)

Currently. this mod is effectively dead