This is not about citation style, but about reference types. Paperpile covers many main one: journal, book, chapter, presentation, etc. — but some key ones are missing. For example:
*Congressional/parliamentary hearing/testimony
Well, actually, that’s the only one I have reached for and not found.
All ref types in Endnote are here: http://www.msg.ucsf.edu/agard/Software/EndNote%20X1/EndNote%20X1.app/Contents/Resources/EndNote%20X1%20Help/Appendices/List_of_Reference_Types.htm
It would be cool to have all of them available in PP, even if all those not currently present were relegated to an obscure box. I imagine this may be a low priority but thought to throw it out there.