I have to second Jun and add that I never been to a dojo where toe crossing was an issue or line-up by rank was customary.
However, I have had some comment by one person on the colour of the top I wear under my gi. The top should be white instead of the black I wear during normal class for practical reasons. To avoid offending anyone (especially Japanese teachers) I wear white tops during seminars but I have no idea if there is a rule about that sort of thing.
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