NFL rule proposals primer: Breaking down possible changes to overtime, onside kicks and more (msn.com)
4. Permit replay officials and designated members of NFL officiating department to provide objective information to on-field officials
"When clear and obvious video evidence is present," this proposal would allow for game-day crews to get help as it pertains to correcting on-field rulings pertaining (but not limited) to receptions, interceptions, fumbles, plays on the boundaries, spotting the ball and whether or not a player is down by contact. Basically, on-site officials would get a helping hand on properly legislating objective plays when warranted – though the designated support from the officiating department "does not have the authority to instruct the on-field game officials to assess a penalty against a player," a replay restriction that's already woven into the league's rulebook.
7. Expand jersey number options for certain positions
The Kansas City Chiefs would like to see the NFL loosen its restrictions on which players can wear given numbers, which sometimes puts teams in a bind. For example, when the Seattle Seahawks traded for DE Carlos Dunlap, who wore No. 96 with the Cincinnati Bengals, last season, they wound up putting him in No. 43 because they didn't have any available numbers between 90 and 99.
The Chiefs' proposal would allow defensive backs to wear numbers between 1 and 49, while running backs, receivers and tight ends could also have access to anything between 1 and 49 as well as 80 through 89. Linebackers would be eligible for any numbers excepting those between 60 and 79.
8. Change options for winner of overtime coin toss, create true sudden death format
Courtesy of the Baltimore Ravens and Philadelphia Eagles, this proposal would revolutionize OT yet again while aiming to minimize any advantage winning the coin toss confers. In a nutshell, the winner of the coin toss would either choose to spot the ball anywhere on the field of play to start overtime – in lieu of a kickoff – and allow the other team to take possession or opt to defend
or instead defer the spot of the ball to the loser of the coin toss, then decide whether to take possession at the designated spot or play defense. First team to score wins, though the game will be ruled a tie if no one scores after 10 OT minutes.
9. Change options for winner of overtime coin toss, modify extra period
In an alternate overtime proposal submitted only by the Ravens – Baltimore's measure also calls for the elimination of OT in preseason – the previously outlined suggestions for the coin toss, lack of a kickoff, spotting of the ball at any point of the field and one team choosing to play offense or defense would still apply. However in this framework, the game would not end in sudden death. Instead, overtime would last 7 minutes and 30 seconds (half a standard quarter). Once time expires, the team with the most points wins, or the game is declared a tie if the score remains knotted.
10. New mechanism to retain possession instead of onside kick
As previously noted, onside kicks have become much harder to pull off as player safety continues to be emphasized. As such, the Eagles propose that a team could be granted two opportunities per game to retain possession after a score without having to use the onside kick stratagem. Instead, after a score, a team would be allowed to maintain possession by executing a fourth-and-15 play from its own 25-yard line. Convert, and the team with the ball gets a fresh set of downs; fail to convert, and the other team takes possession at the dead-ball spot deep in their opponent's end of the field.