Right-click the book from your library view and select edit ToC. Remove the Title entry from the ToC. Rename the Cover entry to "Title". Now the Title link will go to the cover and not the Title Page.
You can also choose Edit Book and edit the ToC html page to make the Cover link expand to include the Title link as well. Just remove the </a> <a href="***"> at the end of the Cover link and the beginning of the Title link. Then clicking on either one will open the same shared link to the Cover.