The problem with making a world map for RTW would be the amount of sea it would need.
RTW won't load maps with large sized areas of sea. You might be able to do a world type layout on a very small map, but that would defeat object of exercise, to show world in any sort of detail you'd need large map, and then sea would be too big to load.
(problem doesn't happen in M2TW)
EDIT: see
http://www.twcenter.net/wiki/Landmass_Crash
for more explanation
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