Here's a list of mine that I keep. I'm in the process of vetting out the latter half with references, etc, but let me know what you think.
https://docs.google.com/document/d/1vdOIfq4oJu1f8hT9zmeh_YgTB12OPq_DI0RaKrZFSk8/edit?usp=sharing
Here's two you could add to your list.
9-4-1-a: While a pass is in flight, only a player who is eligible to touch the ball may bat it in any direction (Exception: Rule 9-4-2).
Rule 9-4-2: A backward pass in flight shall not be batted forward by the passing team.
Proposed language:
9-1-4-1-a: While a forward pass is in flight, only a player who is eligible to touch the ball may bat it in any direction.
9-4-2: A backward pass in flight shall not be batted forward by the passing team.
I believe this helps simplify the rules language a little bit by removing the exception altogether. The intent and spirit of the rule are preserved, it just makes the rule a little more straightforward by reducing the complexity than an exception can generate, which helps officials with comprehension and recall of the rule.
Modifying rules so that simulating a pass into the ground results in the ball being dead.
Existing rules:
4-1-3: A live ball becomes dead and an official shall sound their whistle or declare it dead:
4-1-3-o: When a ball carrier simulates placing their knee on the ground.
4-1-3-r: Any time a ball carrier simulates or fakes a feet-first slide, the ball should be declared dead by the on-field officials at that point. (A.R. 4-1-3-III and IV).
From my understanding, the reason for these two acts declaring the ball dead, are because Team A has essentially conceded the down by simulating the end of the play. I propose a rule modification that would have simulating spiking the ball would result in an immediate dead ball.
All three situations have the same goal: to deceive the defense into giving up on the play because they have signaled that they will take the yardage gained to that point, and no more. Simulating spiking the ball has the exact same intention as simulating kneeling and simulating sliding: it is to lull the defense into believing that the play is over, and to give team A an unfair advantage. Kneeling and sliding have been appropriately addressed within the rules, but faking a spike has not.
Simulating spiking the ball into the ground to conserve time and then throwing a legal pass is not the same as a pump fake. A pump fake exists to draw the defense out of position and allow a receiver to gain separation from a defender to catch a pass. No defense will assume that with a pump fake, the play is over; play continues until the natural end of the play.
There is significant mechanical differentiations between a pump fake and simulating spiking the ball into the ground, so it will not be difficult for officials to determine whether or not the passing action was a pump fake, or to simulate giving up on the play.
As with simulating kneeling and sliding, there should be no penalty associated with this action, but the ball should be immediately declared dead, and treated as if a spike did occur. This gives the offense the benefit of a spiked ball, without penalizing them by having a running clock. The defense gets the benefit of the loss of down, without giving up a big play/touchdown through a deceptive act.
I am not aware of any other act in football that allows an offense to simulate the end of a down, where the ball is not immediately declared dead. I believe this change would be beneficial in standardizing all play situations where an unfair advantage could be obtained through simulating the end of a down, making the game more equitable.