While I agree with your premise, we currently have 4 styles of housing that are on 512m parcels, a 5th seems redundant.
I fully support the waitlist idea, it would make life so much easier as I wouldn't spend hours randomly hitting refresh to see if anyone's abandoned their parcel.
And maybe they could look at expanding some of the current old style parcels to include garden space to expand into a 1024 plot? I'd be fine with a Meadowbrook on a 1024m plot for example.