You should make single feature requests with the request mentioned in the headline (e.g. "Please add the one-knob-protocol to the Series III mixers "). Otherwise nobody knows what to vote for in particular.
It may also be that some requests or similar requests are already listed and voted for. You can always add a detail, if you like.
One of your feature request is not really feasible: The SL 62S is the only 64-channel mixer, all other (except 16R) are 32-channel mixers. It has been said officially that the SL mixers will never be cascadable. But it is possible to use 32 flex mixes: 16 outputs at FOH and 16 outputs on stage. Another possibility is to use 32 flex mixes via AVB network only.