Just suggesting here,
but it would be nice if the Login Screen for a domain could read in to multiple domains. This way for when having a URL you don't have to setup two access areas for multiple domains because you have to make a new FTP port for each domain. This also could allowed a Global user area within the administrator area, Allowing 1 user to have rights too many domains or just 1 domain setting up rights to each one.
Just saying this could be helpful if you have more than 1 domain.
(The global Username database could mess up your guys cost.)