If you are at the bar, and your wife is bitching, and there is no one there to here her -does that mean she is not bitching?
Just thought I would add a little humor, but it is not meant for sake of taking your post as humor.
I don't think your subconcious is made to be in a totaly organized atmosphere. I think it counter acts being concious. I agree with your Idea about the laws of pysics. When your in a dream state, while these events may not actually take place, from what I understand, is that at the time your mind thinks it is an actual event. Although I have been no where close to this height of lucidity in my dreams, some people can control there environment quite handily. I have read of people praticing speeches or golf swings in their lucid dreams. To me you would have to have a pretty contolled atmosphere. If our dream worlds are held together by our imagination, then some ponder wether or not it is write for us to altar are dreams by becoming a lucid dreamer.