I’d like them to automatically close when the room is being depressurized to protect the rest of the ship, or when the room is filled with fire, or if a poisonous external atmosphere from a hostile environment (planet or moon) is pouring in through an opening. This would resemble how bulkhead doors behave in ocean-going vessels: They close even without main power being on.
This is indeed the plan, and the logic to support this has already been implemented and should be ready to plug into the sensor entities that actually detect changes in pressure or toxic gases when those come online.
I think it was featured in an older ISC video, but the intended behavior is that the connected doors will close automatically and will disable the proximity sensors until pressure is restored or the gasket behavior is disabled. You’ll still be able to manually open and close doors (unless otherwise enforced by a proper airlock system), but you won’t have to worry about accidentally venting the ship just by walking by anymore.
As for OP, @TheBrotherGrimm, this should be working in the PTU now; is it not?