If it is the case that you want ops to be able to type:
!AddBanList Aubs

and it stores their nick and address in the users list, then use:

on *:TEXT:*:#:{
  if ($nick !isop $chan) { Notice $nick you must be an operator to preform this command. | halt }
  if ($1 == !AddBanList) {
    if ($2 ison $chan) {
      mode $chan -o+b $address($nick,3)
      kick $chan $nick Blacklisted.
      /guser =100 $2 3 $nick
      ;The above adds someone to the userlist with level 100
      ;in the form *!*user@*.host
      ;with the info as the nick of the person who added them
      /ChanServ AKICK <nick/address> <reason>
      ;<reason> can be anything ot you can use $ulist to get
      ;the .info (person who added the nick
      ;Or what ever the command to add someone to chanserv's list (either by nick or address)
  /auser -a =100 $2 $nick
  ;Can't get the users address, so use their nick.
  ;You should also get chanserv to add them to AKick

then have an on JOIN event that checks to see if the level of the joiner is in the list using:

$ulevel - Returns the user level that was matched for the currently triggered event.

Don't know if this is actually what you want, but hey ho!! - Hope it helps!