With this script you can set a overlimit in your channel.

on *:load:{ 
  set %overlimit $$?="How many more numbers in the channel?"
  echo -a * Overlimit set to  $+ %overlimit $+  $+ .
}

on *:unload:{
  unset %overlimit
  unset %limit.users.*
  unset %var.inc
}
menu status,channel {
  -
  Limiter
  .Overlimit:{
  set %overlimit $$?="Set overlimit"
  echo -a * Overlimit set to  $+ %overlimit $+  $+ .
} 
  .-
  .Unload:unload -rs  " $+ $script $+ "
}
alias call.limit.1 {
  if ($1 == $null) {
  echo -a * Error. Channel not specified.
  halt
}
  if ($1 != $null) {
  if ($me isop %limit.users. [ $+ [ $1 ] ]) {
  mode %limit.users. [ $+ [ $1 ] ] +l $calc($nick(%limit.users. [ $+ [ $1 ] ],0) + %overlimit)
  unset %limit.users. [ $+ [ $1 ] ]
  halt
    }
  }
}

on !*:part:#:{
  set %limit.users. [ $+ [ # ] ] #
  .timer 1 3 call.limit.1 %limit.users. [ $+ [ # ] ]
  halt
}

on *:kick:#:{
  if ($knick == $me) {
  halt
  }
  if ($knick != $me) {
  set %limit.users. [ $+ [ # ] ] #
  .timer 1 3 call.limit.1 %limit.users. [ $+ [ # ] ]
  halt
  }
}

on *:quit:{
  %var.inc = 0
  :loop
  inc %var.inc
  if ($comchan($nick,%var.inc) == $null) {
  unset %var.inc
  halt
}
  if ($comchan($nick,%var.inc) != $null) {
  set %limit.users. [ $+ [ $comchan($nick,%var.inc) ] ] $comchan($nick,%var.inc)
  .timer 1 3 call.limit.1 %limit.users. [ $+ [ $comchan($nick,%var.inc) ] ]
  goto loop
  }
}

on !*:join:#:{
  set %limit.users. [ $+ [ # ] ] #
  .timer 1 3 call.limit.1 %limit.users. [ $+ [ # ] ]
  halt
}

on ^*:join:#:{
  if ($nick == $me) {
  set %limit.users. [ $+ [ # ] ] #
  .timer 1 3 call.limit.1 %limit.users. [ $+ [ # ] ]
  }
}