A simple auto away for your bot script. It will automatically make your bot away using random messages in autoaway.txt and come back within a certain time period. Just paste this in the Remotes section (Alt-R) on your Bot script and make an 'autoaway.txt' file with your messages in the mIRC folder. Type !autoaway on/off to make it work.

on *:TEXT:!autoaway*:#: { 
  if ( $istok(on off,$2,32) ) {
    .notice $nick Auto-Away $iif(on == $2, Enabled, Disabled)
    autoaway $iif(on == $2, on, off) 
  }
  else .notice $nick Usage: !autoaway <on/off>
}

alias autoaway {
  var %min = 900, %max = 3600, %m = $1

  goto %m
  :on
  if ( $away ) .away
  .timerautoback 1 $r(%min,%max) autoaway back
  var %x = $read(autoaway.txt)  
  .away %x
  ame is away: %x
  halt

  :back
  .timerautoaway 1 $r(%min,%max) autoaway on
  ame is back. Gone for $duration($awaytime) $+ .
  .away
  halt

  :off
  if ( $away ) { 
    ame is back. Gone for $duration($awaytime) $+ .
    .away
    .timerautoback off 
  }
  else .timerautoaway off
  halt

  :%m
}