Q: Does it create a hub or index or anything showing all the various galleries?
No... you can use a link directory script... or wordpress... or any tgp script though
Q: The script seems super fast and the menu system is cool at first, but there should be an option to keep the menu expanded at all times.
No... the reason we made it an accordian menu like that is because on some resolutions the menu was too long and in firefox you couldn't scroll the frame.