If you can rewind and replay the LD, can you stop it? I do this a lot to regain (and gain more) control of a lucid dream. When I stop the LD i always resight what a LD is, and tell myself that everything in the LD is in my mind under my direct control. This makes for very lucid and vivid LD's, in which you can alter directly what happens with the dream environment. I've done this with 3 out of my five LD's and its worked very well every time. I've tried to make it a habit when i enter a LD to do this.

Hope this helps!