Maybe I'm "the only one" (Never!)but I do not have a crock pot, nor have i used one. As I go into my 2nd hour of stirring refried beans every 10 minutes to get them thick enough without burning, i'm wondering about a crockpot. does it have the ability to cook like a bain marie so that one wouldn't need to stir constantly to get a thick mass? i am a quantity-cooking chef; do they come big enough to do 4-6 qts of product? thanks much.