I take it no-one has actually run this script? If so, are you able to actually add links?
When I submit the script to add the link it refreshes the page back to the submit link page - this time with all fields blank *except* now the title you added for the previously submitted site is now sitting in the category box.
Not counting the install bug (it won't install without creating the tables manually), this is still pretty buggy. Will need some more work before it's ready for public use.