Random thoughts off the top of my head. Woke up with this in my head this morning.

It's a function that operates like on ready {, but you can call it more than once to queue up multiple scripts.

<function name="WhenReady" parameters="params, script">
  if (not IsDefined("params")) {
    params = NewDictionary()
  }
  if (TypeOf (params) = "script" and not TypeOf(script) = "script") {
    // allow parameters in either order, for convenience
    temp = params
    params = script
    script = temp
  }
  if (not HasAttribute (game, "readyqueue")) {
    game.readyqueue = NewList()
    whenready.enabled = true
  }
  if (GetBoolean (whenready, "isrunning") and ListCount(game.readyqueue) > 0) {
    // When a script is running, we likely want a newly-added one to run immediately
    newlist = NewList()
    list add (newlist, QuickParams ("script", script, "params", params))
    game.readyqueue = ListCombine (newlist, game.readyqueue)
  }
  else {
    list add (game.readyqueue, QuickParams ("script", script, "params", params))
  }
</function>

<function name="RedoThis">
  if (HasAttribute (game, "readyinvokedmenu")) {
    newlist = NewList()
    list add (newlist, game.readyinvokedmenu)
    if (HasAttribute (game, "readyqueue")) {
      newlist = ListCombine (newlist, game.readyqueue)
    }
    game.readyqueue = newlist
  }
  else {
    game.redothis = true
  }
</function>

<turnscript name="whenready">
  <enabled />
  <script>
  on ready {
    this.isrunning = true
    if (HasAttribute (game, "readyqueue") and not HasAttribute(game, "menucallback")) {
      hash = ListItem (game.readyqueue, 0)
      invoke (DictionaryItem (hash, "script"), DictionaryItem (hash, "params"))
      if (HasScript (game, "menucallback")) {
        game.readyinvokedmenu = hash
      }
      else {
        game.readyinvokedmenu = null
      }
      if (GetBoolean (game, "redothis")) {
        game.redothis = null
      }
      else {
        list remove (game.readyqueue, hash)
        if (ListCount (game.readyqueue) = 0) {
          game.readyqueue = null
          this.enabled = false
        }
      }
      do (this, "script")
    }
    this.isrunning = false
  }
  </script>
</turnscript>

Example usage:

WhenReady() {
  ShowMenu ("What is your favourite colour?", Split("red;green;blue;yellow"), false) {
    player.colour = result
    if (result = "yellow") {
      WhenReady {
        Ask ("Would you like a banana?") {
          if (result) {
            msg ("Well, tough. This was just an example to show that you can nest calls to WhenReady.")
          }
        }
      }
    }
  }
}
WhenReady() {
  ShowMenu ("What is your favourite cheese?", Split("cheddar;swiss;blue;brunost;edam"), false) {
    player.cheese = result
  }
}
WhenReady() {
  ShowMenu ("Is there any point in this?", Split("no;not really;yes;fish"), false) {
    if (result = "fish") {
      msg ("Stupid answer! Try again!")
      RedoThis()
    }
    else {
      msg ("I quite agree!")
    }
  }
}
WhenReady() {
  msg ("Thanks for answering the questions!")
  finish()
}

(This was just off the top of my head, not tested yet. But wondered if it would give anyone some ideas)