May I suggest a protection for this so nobody can exploit it? A sort of addition:

on *:text:!report*:#: {
  var %n = $nick
  if (!%report.script. [ $+ [ %n ] ]) {
    if ((!$2) || (!$3)) {
      .notice %n You have not entered a $iif(!$2,username,reason) for that report!
      .notice %n Please use !report <user name> <reason for report>
      .notice %n Allow 5 seconds before attempting again...
      set -u5 %report.script. [ $+ [ %n ] ] 1
      return
    }
    set -u20 %report.script. [ $+ [ %n ] ] 1
    .notice %n Thanks for the report, it will be reviewed by an operator ASAP. Please allow 20 seconds before sending further reports. Thank you!
    msg # Report From %n : Nick: $2 ||| Reason: $3-
  }
}