i've kind of been wondering this to. When i'm riding i'll often get the feeling of 'i wish my toes were pointing out rather than in' or something.

Solution: Tonight I biked over to my friend's house and took a beater bike with platforms, i was wearing some flip-flops. I noticed that my moved around to their natural position on the pedals because my shoes didn't prohibit them at all. It may seem like a weird idea, but try riding in flip-flops and let your feet settle where they naturally see fit, then adjust your cleets accordingly.