I line up everything, even when I sit in a place I've never been, I line up walls, windows and columns ( I re-position myself ), pencils and pads, magazines, lamps, etc..... I see no problem with it, if it helps me to concentrate on the reason for being there in the first place.
Making a child stop things that are harmless, reminds me of the old days when they tried to make every left handed kid into a righty, or when they were still discouraging deaf kids from using hand motions or sign language. They are just trying to make the child seem normal in their eyes, regardless of the impact on the child. I would resist the notion, vehemently. That's just my feeling on the matter.
But, I'm no psych, so WTF do I know?
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It's just music for me. The other stims don't work.