How to Select CTRL + Click command

You can load a channel as a selection usinak acyion manager code.  I would also think you coul also add to the selecton by adding accitional channels to the selection.  The Acyion managet load may look something like this:

// ======Load Alpha Channel Selection===============================

function loadAlpha(channel) {

  var idsetd = charIDToTypeID( "setd" );

     var desc2 = new ActionDescriptor();

     var idnull = charIDToTypeID( "null" );

         var ref1 = new ActionReference();

         var idChnl = charIDToTypeID( "Chnl" );

         var idfsel = charIDToTypeID( "fsel" );

         ref1.putProperty( idChnl, idfsel );

     desc2.putReference( idnull, ref1 );

     var idT = charIDToTypeID( "T   " );

         var ref2 = new ActionReference();

         var idChnl = charIDToTypeID( "Chnl" );

         ref2.putName( idChnl, channel );

     desc2.putReference( idT, ref2 );

  executeAction( idsetd, desc2, DialogModes.NO );

}