Can't shed much light either. Waiting on my copies.
According to Graffiti sales people, this is a very restricted app for Vegas.
The FULL version is reasonably priced.
as far as i know, you can do it in graffiti. however, it will need to be imported as another media track, not part of your credit roll track so you may have to allow some space to insert this media file and keyframe it to move together with your credit roll. if you are thinking of extruding a vector file, sorry you cannot do this in graffiti. you can only extrude text from from list of fonts and the spline objects that comes with graffiti (boxes, hearts, cones, cylinders, etc. you can however put media on the faces of these shapes.