Well that's definitely wrong xD I have 50 legs and torsos on every base custom species, and there is definitely some kind of limit to the maximum number of player species *points at what happens when you install both spakni's sith and jedi custom mods*
Not without editing the model. When the model is made, the modeller chooses how the texture is applied to it. If he decides to make it mirrored, then you are stuck with that.