Maybe its also possible that when lucid dreaming does occur it is simply your conscious mind becoming aware of what the subconcious mind is doing and then manipulating what the subconscious mind had started. And as far as limitations defining our persona, I do believe that there are several limitations in the lucid dreamstate. Maybe we have the power to manipulate things more in a lucid dream because our mind isn't busy with the everyday effort of controling the voluntary functions of the body such as walking or moving a body part. Unfortunately I have never had a lucid dream (yet) so take that into account when reading this as this is all just theoretical for me. All in all this is some seriously interesting topics.