I'm not home to get the exact wording but here goes:
- Add a source but set the file type to none so it won't add to the library.
- Browse to the folder through "video files"
- Bring up the context menu on the folder (right click if skin supports mouse, C if it doesn't) and "add favorite".
- most skins have an option to add favorites o the home screen. Through the Skin settings, find home or something to that effect and add custom home item pointing to that favorite.
There are a few skins that don't work well with this setup, Refocus being one. But I've used it and it works perfect under Aeon MQ3, Alaska, xperience1080, and Cirrus. I'm sure it works on more but that's what I've tried.