For the TSA Precheck situation at JFK, best thing to do is reach out to Don Uselmann via Twitter. He heads up the terminal operations for B6 and does listen to customer feedback. I tag both him and JetBlue in any tweets about T5.

On one of my recent flights, a TSA Agent actually pulled an entire regular security line over to the Precheck line. And she was pretty obvious about it too. I've never seen that happen before to that extent. I was livid and reported it.