Another issue is inconsistency among authorities. Scholastic Sailing in the USA allows one roll and flatten to accelerate off the start line. Appendix 8 to the High School Sailing procedural rules allows many other points where rolling/flattening is allowed if it can plausibly be described as facilitating steering. There is no rule against gaining speed, per se. 
This inconsistency makes training young sailors a bit difficult, sometimes. At a recent match-race regatta conducted in Thistles (The Larry Klein Regatta at MBYC), a High School sailor competing against adults, who won every race and the regatta, nearly got DSQed in his last race because his team gybed around the last mark and came out with a ridiculous amount of speed. My co-umpire in the boat was reaching for he flag, but decided it wouldn't affect anything. He was already so far out in front. It might have been better for him to take the DSQ in the long run. 

Hey Mike .. just a bump-reminder to give us your thoughts. - Ang

Warren .. found it.  I haven't visited it since 2021 so it is what it is.  Just to be clear, it was just a simple compilation of all the rules that we should check ..  to see if there was need of a change to those rules (if allowed by RRS 86). 

Spreadsheet: Rules that use Start and the rules those rules touch

There are 2 sheets .. one was based upon the terms .. the next was sorted by the rule.   Anyway .. it was just a WIP worksheet to get a scope of all the places we should look if an NOR/SI approach was used (as apposed to the WS DR). - Ang

Rule J2.1 (4) requires the sailing instructions to state the order in which marks are to be passed and the side on which each is to be left. 

In the diagram below:

The race committee has two courses A and B.

If course A was signaled. Mark 2s is not a mark that begins, bounds or ends the leg of the course and can be touched and passed on either side. Mark 2p is not a gate mark. 

If course B was signaled. Mark 2s is a mark that begins, bounds or ends the leg of the course and cannot be touched and must passed to starboard. Rule 18.4 does not apply. Mark 2p is a gate mark.

Ben,

1. I enclose an extract of relevant portion of Case 50.

A starboard-tack boat in such circumstances need not hold her course so as to

she does so she will break rule 14.

The fact that L took action to avoid collision at a time when W also initiated action implies there was an apprehension in the mind of L. W, as per me, took the action late.

2.  Case 50 does not say anywhere that it can be applied to rule 11.