It would be really nice if the install could happen over
HTTP.  In a number of places where I have worked the only
access to the Internet is via an HTTP proxy/cache server.
There's a bonus here in that if everyone behind the cache
server installs from the same external FTP site, they get
the RPM packages from the cache instead of separately via
FTP.  Plus HTTP is more simple to implement in the client,
more lightweight than FTP in the server, and more robust in
both places.