True, you do need to know a bit about how the application works to read that copy the right way, that is it lets you use M o S as the "to" or "from" of your conversion process, with any other supported figure at the other end, but DW had answered that question a couple of times in threads related to plug-in availability. As you say, there are remappings for many combinations (though not, as far as I know, for Steph to V3) but they are all-or-nothing. By converting textures you can, say, use a V1 skin texture on V3 with V3 eyes or lips or some of the Second Skin painted on clothes.