Introduce bonuses/penalties based on food quality in the mansion (prolly to obedience) , more advanced ones could be a energy/lust boosters and besides we already have milk so why not go a step further to refine that into cheese/butter? Besides that maybe a job for your slaves as a hired cook (based on wits + agility) , thoughts?
Ah, well that sounds like a larger expansion than you might think. Items in general aren't something I've had success playing with yet. I know it can be done, but I'd have to figure that out before I could do something like this. Also, I haven't dug into the farm code at all, and I'd rather not try adjusting it until Aric has got it how he likes it.
A Chef job, might be doable... I've been thinking some new jobs might be nice too. Adding an overall food quality could be done - maybe make a luxury bonus possible. Energy already recovers each turn and you can pay for a daily dose of aphrodisiac in their food already.
I thought more on the food quality thing. I think one thing the character description are missing is weight - thin to fat. Maybe in addition to just "Better Food", add Sweets or Fattening Diet. Add traits: Anorexic, Glutton. make Better Food guide them to a middle ground, no food selection to lean/thin/gaunt, and Sweets/Fattening Diet lead to Chubby/Fat/Porcine/Corpulent/Obese whichever and however many steps.
Maybe affect T&A size too
Forced feeding, sure good idea - maybe under Advanced Brand. I'm not savvy with the sex system so that's probably as far as I might take it. On the slugs I'm not messing with the farm code/mod-wise to speak of until Aric gets it adjusted to his liking first and I think he's still making a lot of adjustment there.