The Limits of God's Tweaking

I argue that the only events that would be relevant to a creature's free decision are those in or on the past light cone of a space time event. The past light cone is all those events that can have a causal connection with the event in question. And it would seem to me that if God were to tweak something in the galaxy Andromeda that is outside the past lightcone of the agent at the time and place that it's just irrelevant to how he would decide. It's not at all clear I think that it would be within God's capacity to do this kind of tweaking that the objector envisions.