1. Provide ability to disable feature adaptive subdivision, this disables snapping to limit surface and brings back iterative results. Best description and reasoning can be found in this (not mine) post: https://devtalk.blender.org/t/subdivision-surface-in-blender-2-8-behave-different-compared-to-maya-and-zbrush/12248/10
2. Expose VTX_BOUNDARY_EDGE_AND_CORNER interpolation option, this makes easier to block out curved surfaces without needing to keep boundary edge crease at 1.0