I'm in the same boat. I have a view that displays all files rated 4-5 that we haven't heard in over a year.
When I select it in webgizmo all I get is a list of album thumbnails (I have no category selected in the gizmo settings for this view, and in the standard view it is just a file list). So basically I can't play that list of files; I can only select one thumbnail at a time.
Edit: the problem seems to be with view schemes that display "file lists" rather any a category or pane. In Gizmo, when you add the scheme and even select "Play all" as an option, you don't get Play All. All you get is the long list of individual files, so you can't play the scheme result, you can only play one song at a time.