I thnk what you want is there. Open Script Workspace, select Show Script Pane, To the right of the word Scripts are 3 icons click the left most one to toggle the check box on or off. The middle one adds a folder and the right most one adds a separator.
Thank you so much for that. Haven't made it to a Mac yet to check (tomorrow) - and I thought that I had played with those - but apparently not!