Hitrush.com

I am interested in a social bookmarking script to be built like (digg),I want it to be free for anyone and wanted to know if you can add something to it. I want to have in the admin section where I can add a default site to be shown after someone joins and after login and after someone submits a site. the site should show for 10 seconds then a button will be there to continue. I would like to have a section for people to pay to have there site listed in this system by the hour, (Ex: $25 to be shown for 1 hour.) and also mix in my default site. Please let me know if you can do this and how [login to view URL] you Chris