You can now try out the Right Mouse Action menu for the Map Widget using the pre-release available in the link below. The folder also contains draft documentation, and an example (screen below). In the example Right Mouse action menus have been defined for both nodes and arcs. Similar to the Page or Widget Actions, you can define & control the procedure, display text, icon, and active state through the model.
The pre-release, the release conditions, and current documentation can be found here until April 21. Of course, you need to have an actively maintained license to try it out.
Please add your feedback - do include screen dumps as we love to see what you can build - as a reply to this post. Happy building!