yes to keep it simple as so the author can understand you can do as an example:
I still wouldn't go with global vars cuz you will tend to get people setting them selvs brb an never saying back then you will have unwanted global vars

on *:TEXT:*:#:{
  tokenize 32 $strip($1-)
  if (!$($+(%,f,$wildsite),2)) { inc -u4 $+(%,f,$wildsite)
    if ($1 = brb) {
      if ($readini(brbonoff.ini,$nick,brb)) { 
        .notice $nick you are already set as brb 
      }
      else {
        writeini brb.ini $nick Brb $iif(!$2,none,$2-)
        writeini brbonoff.ini $nick brb on
        msg # » $nick will be right back. Reason: $iif(!$2,none,$2-) «
      }
    }
    if ($1 = back) {
      if ($readini(brbonoff.ini,$nick,brb)) { 
        msg # » $nick is back from: $readini(brb.ini,$nick,Brb) $+ . «
        remini brb.ini $nick Brb
        remini brbonoff.ini $nick brb on
      }
    }
  }
}