You can add View Schemes to the main tree "list," but not to the very top next to "Audio," etc. To add schemes to the "list," highlight "Start" when adding the View Scheme. You can exclude Podcasts from the Audio and Video categories, then add a new View Scheme to the main list to do what you want, but it won't be grouped with "Audio, Images, Video." You CAN tell the View Scheme to be listed at the TOP of the list, however.
Thanks
Larry