I don't really understand this determination to allow a crooked throw
OB.. its not a determination so much as a judgement.
If both sides contest, I'm expecting that throw in to be straighter than I would if the non-throwing side decided not to contest
At what point are you electing not to compete?
When you decide that you are not going to put up a man to contest the throw, but instead, are going to remain in the ground and set to possibly (or possibly not) contest the maul.
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VM75, IIUC, you would allow a throw to be off the LoT if the opposition do not put up a jumper to contest the throw, but you reserve the right to reassess that throw were the jumper to miss the ball, or if the ball was overthrown, and it continues on to land well off the LoT on the thrower's. If so, then I agree with that philosophy.
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As far as squint feeding at the scrum goes, readers need to understand the end result of what I have proposed rather that focus on the feed itself.
If WR were to adopt a refereeing game management policy that said...
a. if the non-throwing hooker attempts to strike for the ball, and the feed was not straight then the SH should be FK/PK
b. if the non-throwing hooker chooses not to strike for the ball, and the feed was not straight then play on.
...then a couple of things could happen
From a hooker's perspective, knowing that the referee will FK/PK a crooked feed if I strike, I am going to strike more often (gets my team a cheap penalty).
From a scrum half's perspective, knowing that the hooker might strike for the ball, I will feed the ball straight more often.
The whole thing should be self correcting.
Also, a scrum half can usually tell if the opposing hooker is going to strike, because he can see the hooker's foot positioning, so I could even see a tactic develop where an opposing hooker could look like he's going to strike but at the last moment puts his feed back as the SH feeds in order to fool the SH into throwing straight so that his scrum has a better chance to shove the opposing scrum off the ball.
I believe such a game management policy is worth a trial.