I've seen KitchenAid mixers used with hot dogs and bologna to help emulsify the meat, but I've not tried it. My wife has one of the bigger lift bowl models (at the time it was their largest of the semi-commercial types). I think I bought it for her in 1979. She would beat me with a rolling pin if I even thought about using it to mix meat :D. That is her favorite appliance and it gets use weekly.
and yet another reason why my wife was OK with me getting a dedicated grinder... i bought the KA grinder attachment and after grinding a batch of goose breasts it had a hot smell to it so we agreed that I should buy my own kitchen appliance instead of ruining her prized one. ( I got it for her our first XMas after we got married)