Simply put, as of now most of those common household items are pretty much useless. In general, there is now use for them, with only a few notable expections: plastic bowls (but now other bowls, interestingly) can be used as containers and tin plates can be disassebmled for some tin. All the other cups and plates - no matter if made from glass, ceramic or metals - are completely without use, as is the butter knife. They don’t even hold up as a makeshift weapon!
What I propose is to make those items situational useful by adding a flag to them that gives a (small) moral bonus whenever you have them in your inventory/vicinity when you eat.
Reasons why I think this is a good suggestion:
Usefullness: It would add a use to those items without cluttering any menu.
Realism: Because even though survivors life in a zombie-infested hell hole, they’re not animals.
Not intrusive: As it would be completely optional, I don’t see this getting in the way of other features/design choices. If you don’t want to bother with those items, just ignore them and play the same game you do now.
While I think a moral bonus for having silverware could be interesting these items actually aren’t without use. Butter knives can be used for a number of crafting recipes that call for metal and glasses can be broken to get shards of glass that are, again, used for some crafting recipes.
This is a feature I am very much interested in implementing in the game myself.
In addition to the morale boost you just mentioned I think having appropriate cutlery in your inventory or near you when eating should also slightly increase the time it takes to eat a meal. The trait Rigid Table Manners should also give a hefty morale penalty for eating without cutlery.
Spoons - increase morale and consumption time when eating soups.
Tablespoons - decrease coffee and tea preparation time.
Forks - increase morale and consumption time when eating solid food.
Steak knife - decrease meat preparation time and increase morale when eating meat.
I think you should leave knifes out of any cutlery since you can technically use any knife or cutting implement to eat your food. (might not be as easy too eat a teak with a sharp rock but a combat knife should be just ine)