"Documentation Mode" in Magic ETL/SQL

A toggle next to "Try the new Magic ETL" would read "Documentation Mode" and would:

• Put an opaque film over the whole Magic ETL map
• Disallow changes to the tiles
• Enable the ability to draw and color-code sections of the ETL
• Be able to notate what each section is doing

An additional item in the Save menu would be "Save and Run. Update documentation." and would allow you to make any quick edits to the documentation pane needed before saving and running.