Add the Arrow Markup tool as a default tool to the HTML5 viewer toolbar

The following post on the Geocortex Support forum describes how to add the arrow markup tool to the HTML4 viewer toolbar: https://support.geocortex.com/EssentialsGSCForum?id=90660000000XbHkAAK

As this is a tool that is often used by Essentials customers it would be great if it would be part of the drawing tools by default in one of the following versions of HTML5 viewer.