No.
Creationists claim that the speed of light changes wildly, in order to fit the "science" in Genesis, so from that point of view I guess God does change things around whenever He wants. That's what miracles are all about. Besides, to say that God can't change His laws is to declare that God has limitations, which seems to be blasphemy.
As I move down the thread, I see you pretty much covered this in post 561. And in 578. Well, that's what happens when you have a lot of posts to catch up on. More in post 584. I'm really plowing an exhausted field. Well, consider this a placemarker.