I'm also seeing the error of the bump map resetting to 0 after editing.
Many Rhino commands have dialog boxes that can be skipped by placing a dash before the function (eg. "-ViewCaptureToFile"). This allows the functions to be strung together into macro's or scripting through python and others.
Would love to see "-EnscapeTakeScreenshotCommand" suppress the dialog box so one could script the adding or transforming of geometry to create animations (not just a flythrough).
Keep up the great work Enscape team!