I will have to check...
We do support multiple instances of the same portlet on one page. However, I'm not sure if this applies to JSF. I have enountered problems trying to get the MyFaces sample portlet to work with JBossAS4.0.2, but Stan will be looking in to it.
I will have more answers when my time frees up after tomorrow's webinar.
Problem still exist in GateIn 3.1.0 GA