I find this situation interesting as it happens a lot on Wednesday nights where I race. I guess the question here is really the timing around positions 2 and 3. If green alters course before yellow has established itself on starboard then there is a problem (rule 13) or just afterwards (rule 15). If yellow informs green that they are tacking right away after rounding does that satisfy rule 15? There seem plenty of room and opportunity to windward for green to avoid yellow. The fact that green gybed too late and stuck the mark was their decision. 

In some classes it makes perfect sense. Optimists in Ireland and UK use a season- long set of SIs (Major Event SIs) which have been beaten, prodded, tested, corrected and hammered into a robust form by a number of IROs/NROs/IJs/NJs used to cover regional, national and other fleet events at club level. Occasionally, items arise at a specific venue or point in the season where amending these within event-specific Supplementary SIs is helpful, rather than posting "big" amendments to the MESIs. 

Same applies to NOR, particularly where these may be drafted and issued months in advance (even the prior year) for e.g.  National Champs, major events such as Cowes/Cork/DL. 

Fully agree this needs to be managed carefully and the earlier the actual Race officials can help with review the better, and stay away from the "contract" elements for sure!!

Ultimately - I always prefer drafting/reviewing  both together, even if the SIs then sit in a drawer until the event. 

Yes that is my understanding.

Interestingly, I have just researched MLS Rules - The mid-90's American modified 'soccer' rules.  It didn't really work.

However, MLS did have a countdown timer as Ang describes as well as some other variations to the traditional game.  MLS Penalties were pretty funky.

The MLS rules lasted 4 years.

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In this research, I find that the football rule makers, IFAB, remains institutionally conservative and deliberately resistant to game changes.
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I'm also finding that what I see as poor sportsmanship is, in some places, seen as the art of being street-smart and 'doing whatever it takes to win for your team'.  Perhaps all those dives and feigned injuries I saw Columbia doing the other night were heroic... to Columbians.  Tactics celebrated as "viveza" or "gamesmanship".

If half the footballing world are happy with that, things will never change.

On-field tactics such as shirt-pulling, heckling the ref, appealing when knowingly last touched, diving and feigning injury will always be worth-a-go.  If you can't beat them, join them.  Off the field, the unseen underworld will continue to prop up the sport, rightly or wrongly.

I don't think there is a solution coming any time soon.

Yes John, as I said there were obvious limitations with the selected model (not ideal of course but reflective of the reality of funds availability) – albeit, implemented from the outset on an ‘eyes-wide-open’ basis by all the parties, as I understood. 

By ‘senior IJ online support’ if needed, I mean to simply call on an ad hoc basis - where second opinion felt needed to be sought – and to remotely follow things.

We have attempted to recruit more JITs here (just myself at present) to no real avail so far but are actively seeking same for the future seasons. 

Appendix T route was included in the SI’s, for those applicable matters (in fact, it was well engaged in the third regatta) - but is still a bit ‘novel’ for competitors here it would seem (I have also noticed that some IJs are supportive of Arbitration process and others are not).

The process of elevating any Appeals was fully understood by all (via MNA etc) – just that none were forthcoming.

That being said, it all seemed to go along quite well 'considering' – from the perspective of MNA, OA (budgets) and competitors etc. I am not sure yet if this model will be selected again or otherwise for the coming National Season4 or a more conventional approach adopted (TBC), and for myself, I will just fit-in again with what is selected by them.