The major improvement in the next iteration of the HTML5-based Web.TextControl editor is the available API that helps to manipulate the content programmatically. In combination with a server-side ServerTextControl instance, a Selection object can be edited and passed back the editor.
Additionally, several events are available to interact with merge fields. This allows the insertion and manipulation of merge fields using your own interface. The following animated screenshot shows a custom TreeView control to insert merge fields and reusable text blocks programmatically.
Stay tuned for more!