I think it's like an "open world" video game. There are "N" tracks, but at some point all tracks coalesce to one track -- like when the eight people boarded the Ark, and survived across the bridge from the First World, to the Second World (my speculation of the real definitions; Third World will be when Heaven (the First one) arrives in Earth).

So while you're right, there are things they can do that are unimaginable -- there are, also things that I can imagine, that they cannot do.

They can't get through the firmament, for one. At least, not yet. :)

Each time we pass through "in Earth" realm, we can affect outcomes. Just as e.g. the GTA or Saint's Row games. But you will always watch the same "cut scenes" -- perhaps? Not sure if e.g. the Flood; or Hitler; or the Crucifixion; can be avoided. But maybe that hangnail I had a few years ago might? :)

Still getting the hang of, here. God bless.