From my perspective, lucid dreaming can be used to create change in the world the same way that spells and ritual can in Wicca and other pagan practices. I use ritual (or induce a dream) to focus my intent and willpower on the action that I want to take, and that's "step one" of creating the change I want to see in the world.

Say I wanted to keep my house clean. I might use one of these tools to emulate the refreshing feeling of having a clean house, which would help to motivate me to do the work to keep it clean on a continual basis. By doing this, lucid dreaming (or magic) might actually be able to move objects in the physical world... by motivating me to do the work of moving the objects in the physical world.