Well, if you're using TDT, then conditioning on the initial state of your physical computation screens off most such problems. But if you don't break down your causal graph that finely, then there are all sorts of situations in which crazy people might be tempted to use EDT. I think Drescher in his book gives the case of someone who observes that people usually decide to cross the street only when it is safe to do so, who concludes that by deciding to cross the street they can make it safe.