There is no login button at the index page of the gallery. Do you think a login link could be implemented somewhere? Its kinda hard to remember the exact link for logging in and I always clear cookies so I need to login every time.

With modrewrite the link is pretty simple: www.yourdomain.com/zenphoto/admin or www.yourdomain.com/admin J
But of coruse you can just add a link to the login to your theme files.