To use the script you will need the alias from my last post.

Type in the top editbox and click the reverse button your reversed text will appear in the bottom editbox.
You can have your text reversed in realtime just check the checkbox and type in the top editbox.
You can copy your results from the bottom editbox by clicking the copy button.

Code:
dialog reverse {
  title "Reverse Text by Maffew"
  size -1 -1 370 87
  option pixels
  edit "",1,5 5 360 23,autohs
  edit "",2,5 33 360 23,read,autohs
  button "&Close",100,315 63 50 20,ok
  button "&Reverse",101,195 63 60 20,default,disabled
  check "R&ealtime Reverse",102,5 65 110 20
  button "C&opy",103,260 63 50 20,disabled
}
on *:dialog:reverse:edit:1:{
  if ($did(102).state) { 
    did -b $dname 101
    if ($did(1,1) != $null) { 
      did -o $dname 2 1 $reverse($did(1,1))
      did -c $dname 2 1 $len($did(2,1)) $len($did(2,1))
      did -e $dname 103
    }
    else { 
      did -r $dname 2 
      did -b $dname 103
    }
    return
  }
  elseif ($did(1,1) != $null) { did -e $dname 101 }
  else { did -b $dname 101 }
}

on *:dialog:reverse:sclick:101:{
  if ($did(1,1) != $null) {
    did -o $dname 2 1 $reverse($did(1,1))
    did -e $dname 103
  }
  else { did -b $dname 101,103 }
}
on *:dialog:reverse:sclick:102:{
  if ($did(102).state) { did -b $dname 101 }
  elseif ($did(1,1) != $null) { did -e $dname 101,103 }
  else { did -b $dname 101 }
}
on *:dialog:reverse:sclick:103:{
  if ($did(2,1) != $null) { clipboard $ifmatch }
  else { did -b $dname 103 }
}

menu status,channel,menubar {
  -
  $iif($dialog(reverse),$style(2)) Reverse Text:{ dialog -m reverse reverse }
  -
}