It's a stretch but here goes.

Sometimes - admittedly not often, but sometimes - the way things get done re changes in FAR's, operating manuals, etc., has its genesis with a letter to a Congressman and/or Senator.

I say this as an FAA retiree who answered congressional inquiries during parts of my career.

If you (and others) feel strongly enough about window shade positioning, take the time to reach out to your delegation(s). You shouldn't overlook copying the agency and the airline, either.

As I have stated previously, letters to Congress(wo)men and Senators do get attention. In making this suggestion, I'm not trying to be facetious, snarky, etc., just for the record.