When login_required is enabled, the title of the login page doesn’t include the short_site_description. After logging in the title of the home page is of the form: title - short_site_description. I would expect the same behavior for the login page, especially because crawlers don’t reach the home page (i.e. the site gets listed by the title instead of title - short_site_description).
Hmm, we should probably fix this @techAPJ?