It seems to me that the resultant meshes from Memento want to be rounded even if the object has 90 degree intersecting planes. Push and Pull edits are not able to clean up / simplify surfaces they just keep rounding them off. This is especially frustrating on inside corners. Can there be a tool that creates edges that are then able to be connected to the mesh? Could they be locked so that they are not warped by the push/pull tool? I have found that desimation of the mesh helps when trying to create flat surfaces, but I am not sure if accuracy suffers to non-planar surfaces when that is done.