Well I trust toady to include it in a tastefull manner if he come to it.
However, biological waste management is a feature that I would love to see implemented.
It's one of the very basic, and very important, part of city, and fortress building that is still missing.
"Fece" is a impraical, and arguably distastfull way to put it: fish guts, dead annimals part, food leftover, manure, compost ... could be trated as such an calling them all by they name, treating them specificaly could be tiresome, especially for the computer who would have to treat them as liquids mixing instead as one liquid.
Why must i be implemented? Well, without it, no fortress, no city, will look real if not. Exept of course if the player is somehow pretending it exist but that is bad.
An exemple : untrained Animals in living room --> manure everywere -->stables.
Sewage system only required if you add biological waste. Indoor buchery? Where you guts annimal? Ok But you'd better get the waste out. And while you're at it, better get some soap for the cook. Or not, the epidemy should not be overwhelming. But a bit of colera should be in order if your fortress is really filthy.
"Omg, I'm sure people will start drowning elven in rotting biological waste" or something. Well, did you ever look up the "most evil horrific things you're done" section? Do you realy think this would offend poeple more then what they did in there? Some of them have even left Elves going on ALIVE and UNHARMED!!!
Well, without it, something is missing.