The Poser-scene scaling idea has been used successfully when rendering Poser objects in Carrara. In earlier versions (Carrara 1 and 2), we found that the Poser eyeball structure was so close to the eyewhite in a Carrara scene, that it gave weird transparency artifacts, usually appearing black or grey. The fix was either to delete the eyeball, or to scale up the entire figure 2,000%. I think this was bikermouse's idea, or maybe nomuse, a couple of years ago.