Still though, if we're looking at it from the aspect of cheese versus change, lets think for a second about what milk ( and by extension cheese ) represents. It represents nurture and comfort. And as the goddess of livestock and the harvest, not just of cheese, Cowsea is by far the most kind and represents the all to rare element of stability in a dwarf's life. The drive to settle down and accept who you are now as you are now and be okay with it. On the other hand, Urist is the force of change, the urge to wander and to improve* yourself. To become a brand new person where once there was another. In some regards, there's an element of dissatisfaction in there. So in a way, I could see where people are trying to play the good/evil cards, but it's not really. It's more of a struggle to balance self-improvement and being happy about who one is and one's circumstances. After all, too content and you become docile, complacent, useless. Driven by too grandiose a dream and trying to change too much too fast? You'll burn out and slip into self-loathing that very well could lead to actual, literal suicide. We want our Misty to change and to improve, but not too put so much pressure on herself that she goes insane. And that's more what I think the shoulder deities will represent.
Don't get me wrong, there could be mores that aren't strictly to do with this sort of thing. For example, say a dwarf is in stuck under a rock or something. It could go like this...
Urist: "No, let him save himself. He has to go through the struggle to get stronger."
Cowsea: "Mooo... You should help him. He could be a valuable companion and it doesn't look like he can make it himself."
Or something like that... Not so much good and evil, both deities want what they think is good for both Misty and the other dwarf, but what they want is still in contrast and is probably how dwarves really think. ( But I'm just guessing. )