🚀 go-pugleaf

You grabbed my attention with this (don't ask me why -- sometimes, things just seem to demand a solution). This method will add an anchored item to an insertion point, using the default settings you've established.

InsertionPoint.prototype.addAnchor = function() {
	var aDoc = app.documents[0];
	var anchProps = aDoc.anchoredObjectDefaults.properties;
	var anchCont = anchProps.anchorContent;
	// Make new object with correct default settings
	if (anchCont == ContentType.unassigned) {
		var myAO = this.rectangles.add();
	} else {
		var myAO = this.textFrames.add();
	}
	// Make new object right kind of object
	myAO.contentType = anchCont;
	// Recompose parent story so geometricBounds make sense
	this.parentStory.recompose();
	//save users measurement preferences
	userHoriz = aDoc.viewPreferences.horizontalMeasurementUnits;
	userVert = aDoc.viewPreferences.verticalMeasurementUnits;
	aDoc.viewPreferences.horizontalMeasurementUnits = MeasurementUnits.points;
	aDoc.viewPreferences.verticalMeasurementUnits = MeasurementUnits.points;
	var myBds = myAO.geometricBounds;
	myBds[0] = myBds[2] - anchProps.initialAnchorHeight;
	myBds[3] = myBds[1] + anchProps.initialAnchorWidth;
	myAO.geometricBounds = myBds;
	aDoc.viewPreferences.horizontalMeasurementUnits = userHoriz
	aDoc.viewPreferences.verticalMeasurementUnits = userVert
	myAO.applyObjectStyle(anchProps.anchoredObjectStyle);
	if (anchProps.anchorContent == ContentType.textType) {
		try { // might be null
			myAO.parentStory.appliedParagraphStyle = anchProps.anchoredParagraphStyle;
		} catch (e) {}
	}
	myAO.anchoredObjectSettings.properties = aDoc.anchoredObjectSettings.properties;
}

Well, I think it will. I tested it using:

myIP = app.selection[0];
myIP.addAnchor();

and it seemed to work. If you try to use addAnchor() with any other kind of object, you'll get a run-time error.

Dave