1. I'm not sure I am following you - the "categories" are the areas listed on the main page.
2. You create the Main categories in the Admin section of PhotoPost and your users create albums which they can "assign" to the Main categories.
3. ViperAlley is mostly a stock PhotoPost, but I have done some custom modifications which rotate thumbnails and use a slanted "frame".
Please do not PM me for support or sales questions. Thank you for your understanding.