is it possible for my clients to register for an email account from the login page of my install of roundcube if so how
There is a registration plugin for hmailserver but I don't think there is for any other mail server.
Is it possible to develop a way to make email templates and store them in roundcube?
I have a template plugin for RoundCube, contact me at scott [at] skaero.com if you want more information about it.