Raising chickens and rabbits is very straightforward...
I don't know how hard it is to code the "item" animals with the breeding traits from the actual, domesticated animals ingame, but raising these squishy critters should be at least rewarding in some aspect and not just left in coops to overpopulate.
Or at least a random event where a hen becomes this kind of hen or this cock becomes this kind of cock... y'know what I'm saying?
Rabbits tho, there should be more to them other than meat and fur...
More varieties of item animals. It's time we seen a black rabbit and a white cock.