I'd say I don't want this thread.
Mostly because I'd like a lot of things others don't. Ventilation, poo, magic (ventilated poo magic?). I'd especially like to have the need for light in some way. Mostly just so I can burn all that useless tallow, but it'd be nice. If not for dwarfs for some reason (infrared vision etc.) then at least for humans or others who would not be so adapted.
What I don't want is the FPS lag. And pointless frustrating micromanagement (which toady has been good at taking care of, so I'm not worried). That's about it.
As a more legitimate argument against airflow and ventilation(the vent zombie thing was mostly a joke reason, mostly) I don't think it could be put in in a way that's meaningful without being in the way. There's all kinds of issues like:
Can more air get down a wider staircase.
how far from the air supply can a place be before there isn't enough air.
Do the caverns have a constant air supply?
If so, where does it come from.
If not, how do things live.
Do any underground crops produce oxygen?
If so, how fast?
If you encase an area above ground in wood, is it air-tight? (probably, since it would be water tight)
What if you encase it in glass?
Is there a goblin ambush hiding in your vents?!
Also there's fps to think about, since such a system would be fairly complicated. But in all honestly, I'm only very slightly against it. Right now, I kinda like being able to build my forts without worrying about such things.
I want magic in the game personally, because I want artifacts to have magic properties, especially if they relate to the mood. I'd like weapons made from possessions to be pure evil.
I don't know if I want waste or not. Building a plumbing system seems like it would be difficult. I'm picturing digging out a large tunnel system, laying pipes throughout the whole thing, and connecting the pipes to all the public toilet areas and an underground lake, because a bathroom for each dwarf would be too much work. At least with pipes, there'd be no worry of accidentally flooding the fort when you pump water through the sewer system.