While all of the suggestions sound amazing they also sound like a lot of effort on the developers part. Simply adding an option to bind a seperate key (or the same one if you prefer the way it is currently) as push-to-transmit like suggested in 1. would in my opinion already be a major step towards an immersive radio experience with only a fraction of the work required.
So if these features do not get scheduled simply because the const/benefit ratio doesn't work out, please consider at least part one of this suggestion.