airtags - your information is not factually correct.
VB do not operate 1:50 on B737-700 - it's only done on B737-800 (4 crew) - the excemption is only valid on that aircraft type.
The same excemption currently exists for Qantas for B737-800 - refer to CASA 320/09 and 321/09.
The same excemption currently exists for Jetstar on A320.
Crew do not "go against the flow" to overwing exists - crew responsabilities in an emergency are their own primary doors. The overwing exits are opened by the ABP's sitting at the overwing - as per the excemptions there must be a minimum of 2 ABP's in each overwing exit row (block of 3 seats) and they are provided with a CASA approved brief by crew prior to take-off.
In the second part of your post I assume you're referring to CASA project 01/09 which is the review of CAO20.16.3 - as per the CASA website that project is still on going and the "requirements" you've quoted below appear to be not yet decided by CASA.
I'm certainly not saying I agree with the proposed changes however at least make an effort to post factual information.