It looks like that is the only option at the moment. I found out when I did the searches that the Raw interpretation is done by the OS and not the applications in the case of Iphoto and Aperture (Mac Applications). I found one site that talked about hacking the system file that controlled the cameras that the system recognized but that file no longer exists in Leopard so I could not even look at it.
I understand from this fellows article that there is a list of Pentax (and other makers) models and if you could add the super to the list you could get it to recognize the format.
The article is here
OK1000 Pentax Blog: Waiting for Aperture and iPhoto Support: Modified Resources for Pentax *ist DSLRs
Good luck if you try it. It seems to depend on which version of the OS you have.