Wait for user?

No, but you can put the user in an interactive step like a Free Transform. Just like an Action with an insert menu item or turning on an action's steps dialog.

You can also make the script two scripts or a script that is run twice. Where it does one process the first time and a second process the second time.

//////////////////////////////////////////////////////////////////////////////////

//

// Copyright 2002-2003. Adobe Systems, Incorporated. All rights reserved.

// This scripts demonstrates how to rotate a layer 90 degrees clockwise.

// Original file came from PSCS scripting\samples\javascript\RotateLayer.js

//

// Variation Copyright(c)Douglas Cody, 2004, All Rights Reserved.

// http://www.clikphoto.com

//

// Updataed John J McAssey 2008 - 2009 http://mouseprints.net

//

// This script is designed to be used by a Photoshop Action twice

// A good pratice to use when creating an actions that use this scipt is for the action

// not to do a save or play some other action between its two useages of this Script.

//

// This script will look at the document orientation (portrait vs landscape)

// On the first execution, if the document is a portrait, it will be rotated

// to a horizontal.

// On the second execution, a rotated document will be

// restored to a vertical. This effectively toggles the orientation ONLY if

// the original document started out as a portrait.

//

// NOTE: Meta-data Info Instructions field is modified to hold an interim state.

//

// Bug Fixes by JJMack, 2008, with the original code Square images were always

// rotated -90 and marked "rotate back" with two executions you wound up with

// an upside down image... The original code would also fail to rotate an image

// back if the action added canvas and change the rotated images aspect ratio

// to other then landscape. Again you wind up with a marked upside down image.

// In addition units the compare could fail because the script did not set the

// units to use for rulers. 

//

// Updated in 2009 JJMack to remove some restrictions try make it near bullet proof

// presserve any data that might have been in Files metada Info Instructions field

// this also allows more one run twice scripts to be used on a document.

//

//////////////////////////////////////////////////////////////////////////////////

/*

<javascriptresource>

<about>$$$/JavaScripts/orient/About=JJMack's Orient^r^rCopyright 2009 Mouseprints.^r^rRun twice script utility for action.^rNOTE:Don't play other actions between runs!^rFirst Run records orintation and rotate Protrait to Landscape^rSecond Run removes orintation recorded and rotates Portrats back.</about>

<category>JJMack's Action Run Twice Utility</category>

</javascriptresource>

*/

if (app.documents.length > 0) {

        var orintation = '';

  if (app.activeDocument.info.instructions.indexOf("<orient>") == -1 ) { // No Footprint

  //alert("first")

  var orig_ruler_units = app.preferences.rulerUnits; // Save ruler units

  app.preferences.rulerUnits = Units.PIXELS; // Set ruler units to PIXELS

  // Add Foot Print to  metadata info instructions and rorate protrait documents

  // alert( " Width = " + app.activeDocument.width + " Height = " + app.activeDocument.height );

  if (app.activeDocument.width < app.activeDocument.height) { // portrait

  app.activeDocument.rotateCanvas(-90.0);

  app.activeDocument.info.instructions = app.activeDocument.info.instructions += "<orient>portrait</orient>";

  }

  else { app.activeDocument.info.instructions += "<orient>landscape or square</orient>"; } // not portrait

  // Reset units to original settings

  app.preferences.rulerUnits = orig_ruler_units; // Restore ruler units

  }

  else {

  //alert("second")

  // Retreive saved orintation and rotate portrait back up

  orientOffset = app.activeDocument.info.instructions.indexOf("<orient>") + "<orient>".length;

  orientLength = app.activeDocument.info.instructions.indexOf("</orient>") -orientOffset;

  orintation = app.activeDocument.info.instructions.substr(orientOffset, orientLength);

  if ( orintation == "portrait" ) { app.activeDocument.rotateCanvas(90.0); }

  // Remove footprint from metadata info instructions

  before = app.activeDocument.info.instructions.substr(0,app.activeDocument.info.instructions.indexOf("<orient>"));

  afterOffset = app.activeDocument.info.instructions.indexOf("</orient>") + "</orient>".length;

  after = app.activeDocument.info.instructions.substr(afterOffset, app.activeDocument.info.instructions.length - afterOffset);

  app.activeDocument.info.instructions = before + after;

  }

}

else { alert("You must have at least one open document to run this script!"); }