I can't imagine that a tidally locked world would experience much in the way of weather-based erosion. With no rotation (or a long term resonant rotation), the factors that create wind and ocean currents along with temperature and pressure changes, and thusly, rainfall, pretty much don't exist, unless, of course, some artificial means (i.e. magic or some ancient "alien" technology) is fueling some form of artificial weather patterns. The surface of our moon or Mercury, for instance, probably haven't changed much over millions of years other than from "small" meteorite impacts.

As far as what Wilbur can do, some of that will depend on what version you are using and what your computer's CPU and memory can handle. If waldronate happens by this post, he can explain it far better than I can.