Toilet service vehicle is already planned. I agree that seeing a bypass pin would be nice. Additionally whilst we are on that subject, it would be nice to see the wing walker stand next to the nose wheel of the plane when making his last transmission, and then exclusively use hand signals. Maybe, whilst on the subject, give him multiple region specific accents, and-
okay I am getting carried away now. But if you ever need a voice actor to do an Indian subcontinent or American accent, HMU!