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Very cool project! Something I'd like to see if you're able and willing would be ocean currents and their effect on climate, also maybe topography interacting w/ wind currents. (I understand these are not easy asks) 

World gen: Maybe a insolation modifier?  If possible maybe orbital parameters as well, like eccentricity , axial tilt, that kind of thing. Idk if that kind of thing matches whatever simulation time scale is going on. 
As for layers:  A slope aspect layer would be nice, and the ability to stack layers at different opacities. I would also like to be able to switch map projections while viewing the map. 
Other: A set of basic tools like a ruler or the ability to make and label points. 

this fence around your garden won't keep the ice from falling

I just wanted to express how much I love this, thank you for the making this.