It would definitely make for good sci-fi. I’ve thought similar things about someone who could walk back and forth through time as we do in space. They’d flit in and out of existence from our perspective and unless they were keeping EXACT PACE with us, it’s unlikely we could make sense of what they were up to.
They’d have to see (sense, not necessarily vision) our speed in time to get in our plane properly.
I also have thought of a second time axis and what that would be like to experience.
I do think Science is rather locked into the arrow-view of time generally. I suppose it must be in order to function properly. Cause and effect as it stands is kinda needed. A fiction of time is required that we _already_ know is a fiction: an arbitrary time standard, encapsulated now in the goings on of the electron shells of two cesium atoms if I remember correctly but THEIR calibrations based upon a mathematically imperfect understanding of the motions of the moon and sun and stars, just like days of old.
The Islamic calendar has it right in that regard, by utilizing observation, although it gets rather complicated even there.
I just woke up but I’m always ready for my mind to go into Time things. Always fascinated by it.