The cooking method doesn't really matter unless you're adding something to it; roasting won't provide an appreciable difference in nutrient content. When your'e cooking them in the crockpot, again, it doesn't change, unless you're cooking it in something; in which case, you're going to also count the thing you're cooking it in.
I just made a pot roast with red baby potatoes. I just entered red potatoes in my tracker, and counted te other ingredients separately. :)