When a user places a ban or bans on a channel, if any of the bans affect any of the users currently on a channel, this script will change the echoed text to display such. Also works for quiet bans, nick change bans, excepts, and invites.

I know the whole /who part doesn't do a ton of good because processing is faster than the server's response, but it should at least update your IAL for future occurrences. There is always the option of delaying the entire mode text by a couple seconds, but for now this is what I use.

on ^*:RAWMODE:#:{
  var %b = $countcs($1,b,e,I),%y = 1
  if (%b) {
    while (%y <= %b) {
      var %x = 1
      while (%x <= $nick($chan,0)) {
        if (!$address($nick($chan,%x),5)) {
          if ($group(#whoing).status == off) .enable #whoing
          who $nick($chan,%x)
        }
        if ($remove($wildtok($2-,*!*@*,%y,32),~q:,~n:) iswm $address($nick($chan,%x),5)) var %bl = $addtok(%bl,$nick($chan,%x),32)
        inc %x
      }
      inc %y
    }
    if (%bl) {
      echo $color(mode) -t $chan $+($chr(42),$chr(32),$nick,$chr(32),sets mode,$chr(58),$chr(32),$1-,$chr(32),$str($chr(58),2),$chr(32),$chr(2)) $+ $iif(%b > 1,These affect,This affects) $+ : %bl
      haltdef
    }
    if ($group(#whoing).status == on) .timer 1 2 .disable #whoing
  }
}
#whoing off
raw 352:*:haltdef
raw 315:*:haltdef
#whoing end