Any "vermin related" bugs could be swept away with a couple of RAW changes, and perhaps purring maggot herding will become commonplace throughout the depths!.
Keeping in mind any vermin to hand can be selected for this role and even made to be embarkable wholesale with common domestic or [ANIMAL] (it wont be contained), but the bug manifests itself in ways in that even if the vermin you had direct domesticated access to were nearby, you still couldnt import any cheese from it, even if the reaction was laid upon it to milk dwarven cheese in its place im quite certain.
So thats' a whole bunch of fields excluded from vermin products which have been potentially fixed, which is usually pretty... over the top given how much the embark screen loves to collect other things of impossible size for man-handling like animal-tears & bee poison. Even as to be as silly to think that dwarves would spend time trying to extract the carmine (conchineal) out of tiny vermin insects like acorn fly eyes. (the red mush whenever one gets crushed, fly blood is actually transparent)
But historically its something people did for profit, and is more believable at least than having them eat a acorn fly's brain-offal (which is a real over-scrupulous thing in the embark screen), then say that it was a suitable meal to sustain a dwarf for its weekly meal.
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Seperate to this, this means that bird feathers could be a real commodity now providing all the code is thorough with how dwarves collect things. All that's required is the tail-end of personal player modding to interpret it with pseudo feather gems and the like.