As to the curtains, you cannot open and close them depending on which team has the sun issue.
I'm not suggesting opening and closing them depending on when the Cowboys or oppeonents have the ball.
Not that it even matters, even if it was open only when the other team had the ball, a Cowboy defender could have to look back into it.
I am saying if something in your stadium, like blinding sunlight for example, can ever possibly be a hindrance to your team, get rid of it,
Same deal for that giant idiot screen that Punters can hit. If your trying to kill clock, and your Punter can routinely hit that thing, they could hit it 3 or 4 times in a row. The play just gets reset ("reply the down") , but the time keeps ticking off each time you do it.