My suggestions.
Football
1. Start the game clock 10 seconds after an incomplete pass or out of bounds, even under 2 minutes to go.
2. No two minute warning.
3. Must wait at least one minute of game time between time outs.
4. Broadcasting network must pay fine of $1 million each time camera is panned on Rex Ryan, Bill Belichek, Odell Beckham, Jr., among others.
Basketball
1. Must wait at least one minute of game time between time outs.
2. When there is less than two minutes left, the team that is fouled has the option of having ten seconds taken off the clock.
3. Fouls need to be called on merit, and not depend on star status.
4. Go back to calling the team from Ohio the "Cleveland Cavaliers," not "LeBron James and the Cleveland Cavaliers."
Hockey
Not too many complaints here. Yes, 20 minutes between periods can be a pain, but it seems that too many times, 20 minutes can go by between plays in baseball and football. Flopping/embellishment is an issue, of course, and will be addressed in soccer.
Baseball
1. No more than one pitching change in the middle of the inning.
2. No more than one conference between pitcher and catcher per inning.
3. If the catcher has to move his mitt to try to convince the umpire the pitch is a strike, it's an automatic ball.
4. Any team for any game has the option of having the DH.
Soccer
1. Significantly reduce the gross corruption and favortism in and around the game.
2. To reduce flopping, no foul should be called unless ref actually sees a foul.
3. If a player somehow gets hurt via incidental or no contact, player must submit to a protocol similar to concussions, which would have to include missing competitions for whatever appropriate time is needed to completely eliminate any strategic advantage of flopping. This rule can apply to all sports.