As far as changing the title, I think you can only do it when you are submitting the page for the first time. So whoever "discovers" it has to edit the title appropriately.
If you are working with a Wordpress blog, you can always use the Platinum SEO plugin to change your title from the default, that way the title of your post can be something other than your main blog name. I title mine by category, then post name, such as
Blogging | Explaining Web 2.0 Features. That is what will come up on the Stumble title as well (assuming someone doesn't change it).