I'll reply about the while stuff separately, but jsbin shouldn't and doesn't prompt anyone to create an account. The only two features you don't have access to

I'll reply about the while stuff separately, but jsbin shouldn't and doesn't prompt anyone to create an account. The only two features you don't have access to is the history, and the /[user]/last shortcut. Everything else, including saving, is available as a non registered and anonymous user.