Video PG in Scenarist BD

[TahoeP]

I am using Scenarist BD v5.3 w/ CS3.
I am authoring a music led HDMV, the Main Program has a black video, then a Pop-up menu on the IG stream. The client would like to have a 'plate' appear for 8 seconds at every chapter point to say the song title which is just a black BG with text. I think the way to do this is either to put the plates on the PG stream or re-encode the black BG vid including the plates. I would like to use the PG stream so I created the plates as Still Images in CS3, got them in BD and all is good, except the client wants the song titles to fade IN and Out. It looks like I can't use the Scenarist I/O effects bcz they don't exist in the PG stream.
Reading the Manual, it does state that you can import a Still Image or a Video into the PG stream. I tried to bring in a .m2v video made in After Effects and make a PG, but that is not working.
Can someone explain how to get a 8 second video into Scenarist as a PG stream or how to format a video to become a PG?
Thank you!