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I think adding visual indicators wouldn't help.
A plugin can accept dozens of controllers.

Projects, if they grow in complexity, must be documented. There is no other solution.
And that doesn't depend on Qtractor.

Perhaps adding a description/notes/comments box to the track and bus properties forms might make sense, just as it now exists in document properties.

But for very complex things, you have to resort to external tools (libreoffice...) that allow you to include diagrams and screenshots.