It would be great if the user could go and just export the layout/theme they are working on in the Builder or in the Editor, including the global settings, CSS, custom presets and elements settings (with a dialog before exporting to select if user wants to export all or select desired Layout/Theme parts). And afterward to have the option to import.
That would save a lot of time when having to switch between theme. For people who custom-edit in the Editor that would also be very useful so they can adopt in Builder styles/changes, they have started in the Editor.
I hope you take this into consideration.
To all members reading this: if you like the proposition, please support it so it attracts the attention of the developers.