That would be up to the person flying the mission. I've found that no single option fits all the people who wish to participate and therefore it's better for the person flying to decide if they wish to stream, do an IRC mission control session, whatever they want. I am changing my role to be that of 'He who giveth scenarios'
Thats the person flying the mission to work out. I will provide the scenario file and the planning, for similar reasons above, is totally up to the person flying the mission. I will provide a launch window in the scenario, the rest is up to the pilot.