An extension of this, which if you are going to do, you probably should do too, is being able to switch your settings between before and after. Currently there is no way to undo a change you have made as I am assuming there is no change history. So if after playing around with the surface for a bit, you can revert it if it is not satisfactory. A way to increase the size of the texture sphere would be nice too, and if you're going to cut it in half, would be even more important as I currently find it too small sometimes.
Ling.