something very cool for worldbuilding would be post-generation map editing specifically meant to emulate changes made by civilizations. say for example i decide a civilization starts irrigating their crops. i believe that would come with it some changes to the waterflow map. if you already intend to simulate the behaviors and effects of whole civilizations, then this shouldn't be too hard to implement; map editing would just call the same functions that the simulation would, i think?
a timeline that shows these changes through the years would also be neat, i haven't yet found a worldbuilding tool that makes such a thing straightforward to do.