Something

alias 96unban {
  if ($me !isop #) { notice $nick I am not oped in # | halt }
  if (!($1 isin #)) { notice $nick $1 is not in # | halt }
  if ($2 == $null) { mode # -bb $address($1,2) $1 }
  else { mode # -bb $address($1,2) $1 }
}