This has taken way too long to implement (Daniel started to do it but that was near the end of his internship, and we left his work hanging for a few months -- my bad!), but I have some good news -- this is partially implemented now!
We went with a URL fragment ("#full") instead of something in the path, like a query string parameter, with the thought that we could then automatically and dynamically add it to the URL whenever you go to full page. That part unfortunately isn't implemented yet (will take a bit more work).
Still, I think if you guys can help us evangelize this feature, it's a good start for now. At least now you can link your users to a full page view right off the bat.
Thanks for your input and suggestions! And thanks to Daniel for taking the initiative in beginning this work. =)