Certainly want more variations there - but it's a bit harder to utilise recordings from the public for that. For the loud speaker stuff, it can be heavily filtered/processed to remove any things like background noise - without detracting from the result, while for the player call outs, those are used much louder in the audio mix, so need to be a higher quality from the start.
Perhaps if people are Melbourne based we might be able to organise something with the public that way, though would have to run that by Ross if there were any volunteers.