As far as anonymous ftp disallowing it's as simple as adding:
That's 1 down, 2 to go:
allowing only several users ftp access, there is a line in /etc/proftpd.conf that says "maximum users" or something like that, edit to your desired #. The other thing with this is that you setup the accounts for these "users" to login to your system, so you could keep a pretty good tally on them with just that ability.
that's 2, 3 is a little easier:
add this to your /etc/proftpd.conf file (I put mine in the beginning):
Here's an example of mine (although I do use anonymous ftp, there might be something else beneficial in it):
# This is a basic ProFTPD configuration file.
# It establishes a single server and a single anonymous login.
# It assumes that you have a user/group "nobody" and "ftp"
# for normal/anonymous operation.
#ServerName "ProFTP MasterC Style"
# Port 21 is the standard FTP port.
# Umask 022 is a good standard umask to prevent new dirs and files
# from being group and world writable.
# To prevent DoS attacks, set the maximum number of child processes
# to 30. If you need to allow more than 30 concurrent connections
# at once, simply increase this value. Note that this ONLY works# in standalone mode, in inetd mode you should use an inetd server
# that allows you to limit maximum number of processes per service
# (such as xinetd)
# Set the user and group that the server normally runs at.
# This next option is required for NIS or NIS+ to work properly:
# Normally, we want files to be overwriteable.
# A basic anonymous FTP server configuration.
# To enable this, remove the user ftp from /etc/ftpusers.
# We want clients to be able to login with "anonymous" as well as "ftp"
UserAlias anonymous ftp
# Limit the maximum number of anonymous logins
# We want 'welcome.msg' displayed at login, and '.message' displayed
# in each newly chdired directory.
# Limit WRITE everywhere in the anonymous chroot
# An upload directory that allows storing files but not retrieving
# or creating directories.
# <Directory incoming/*>
# <Limit READ>
# <Limit STOR>