I have the idea like this :
A list with the nicks that are already saved and on the right a EDIT button which will write the greet in ctrl format 12lawl hi nick under that there will be two buttons
Aplly and Cancel.Apply will save the changes done to the greet and cancel will erase any change you made and the original will be in the editbox again........maybe if that is not enuf ill add a delete button which will delete selected nick from the list and an add button that will use alias

 alias addhi {
  if ($1 != $null) {
    if (%hi. [ $+ [ $1 ] ] == $null) {
      set %hi. [ $+ [ $1 ] ] $$?="Your Greet Here:"
    }
    else { beep $input($+(Oh! $1 allready has a greet,$crlf,Edit your greets),o,Problem) }
  }
}

or??????