Out of this interesting discussion there seems to me like a lot of confusion around a matter that should really be straightforward IMHO. This should all be written down, codified somewhere so it is transparent and everyone knows what is going on, as opposed to some sort of combined game of Chinese Whispers & Snakes and Ladders.

I had a look through MoMS ... surely grades are documented in there, if not why not, and where else would be more suitable? I searched on the word 'grade' ... it's only mentioned in Motocross, Speedway, Moto Trials and Minikhana sections. I was amazed, can someone else try it ... maybe my Mac doesn't work real good?

In the Minikhana section (the only one with detailed specifics of the grading documented IMHO ... rest of them appear to be black magic at the discretion of who knows ... ).
So Minikhana section has stuff like this:
26.5.1.7 After each interclub or Championship meeting competitors will be upgraded within the competitors class as follows:
(a) Riders who place 1st or 2nd overall in
C grade will be upgraded to B grade
within that class,
(b) Riders who place 1st overall in B
grade will be up graded to A grade within that Class,
(c) Riders who place 3rd overall in C grade or B grade will recieve 9 grading points,
(d) Riders who place 2nd overall in B grade will recieve 12 grading points,
(e) Once a rider accumulates 21 grading points they will be moved up one grade within that class. Once upgraded they will commence in the new grade with 0 grading points.
Makes sense to me ... If you're D grade and finish 1st for the meet then you straight to C grade for first race of next meet. Grading points accumulated for other places ... and published ... so transparent, everyone knows WTF is going on. Once you accumulate enough grading points then up you go.

Potentially there is an opportunity to codify what ever is going on in Road Racing grading in MoMS, so it's no longer at the discretion of Mr Nobody?

So how to suggest making an MA rule ... I guess adding a rule is a change??? ... flowchart and all ...
http://www.ma.org.au/index.php?id=138