Hello everyone,
A while ago I created a method to emulate a RubberBand when selecting two points. I recently had time to separate the project and share it on my GitHub. The complete code is available in case anyone wants to improve it, and I hope that in the future Autodesk will release a native method for this. The link is as follows:
https://github.com/SpeedCAD/SCADtools.Revit.UI.RubberBand
Mauricio Jorquera