I understand that it's possible to set a max size for a Factorio map, so how easy would it be to do that here so that the World Map has hard edges to stop players looping around?

I would like to second this, anyone figure out settings max X/Y dimensions for default scale? Also, anyone know the rate of max X/Y to increasing the scale?

From what I can tell from files and testing on scale 1:
Scale of 6(default) has dimensions of 24192x11520, or 756x360 chunks.
Base map size is 4032x1920 (126x60 chunks), just multiply that by scale.