All of those on dialogs can be put into one like:

on *:DIALOG:greets:sclick:7: {
  set %hi. $+ $did(4) $did(6)
  did -b greets 7
  did -ra greets 8 Delete
}
on *:DIALOG:greets:sclick:2: {
  did -ra greets 4 $did(2).seltext
  did -era greets 6 $var(%hi.*,$did(2).sel).value
  did -e greets 8-10
}

into

on *:DIALOG:greets:sclick:*: {
  if ($did == 7) {
    did -ra greets 4 $did(2).seltext
    did -era greets 6 $var(%hi.*,$did(2).sel).value
    did -e greets 8-10
  }
  elseif ($did == $2) {
    did -ra greets 4 $did(2).seltext
    did -era greets 6 $var(%hi.*,$did(2).sel).value
    did -e greets 8-10
  }
}

Yours works the same just looks nicer with less on dialogs :)

Nice Script btw