Ok, I see what you mean, I have logged this in our bug base to be fixed in an upcoming update, i think the work around for now will be to edit the width of the footer to 100% after the page is created.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.