You can already do it, but there's a trick to it...
Set up all your characters and backgrounds as you want them, with no dialogue and, most importantly, NO TITLE. Hit enter. Have a look at the URL of the new page. It contains all the comic info that is sent to the database when a new comic is created. Now, if you make your comic from this base, titled it, and create it, and then hit the back button in your browser, you will get your lovely template, without dialogue or title.