Well, it certainly seems that there are a considerable number of Mac users, myself included.

With regards to the 3D Connexion Space Explorer, I just received an updated e-mail from 3d Connexion's support team indicating that their first response was erroneous.  It is now stated that all of the buttons on the Space Explorer should be programmable from within Poser Pro using the 3D Connexion driver but I have not found that to be true, at least, in my case.  I am awaiting an updated response from their "advanced" tech support.