pal_user ,
Sorry that you are seeing this issue. I could replicate the issue at my end. I have filed a PR for the dev team to work on it.
Right now we only have option to add a JSP page from the palette. I have filed an Enhancement Request to support xhtml pages.
Regarding PrimeFaces/OpenFaces support, let me check with the dev team and get back to you.
Let us know if you have any other issues.