I refer to Second Life as a template.
I want to control user access and controls using their Group or Public status. This can be used unilaterally for media, area/location and functionality/inter-activeness within the environment.
Wether doors open to given locations giving access.
Media players will allow any/some changes.
Functionality levels for interaction, including voice controls. Very useful when giving presentations, whereby a controller/admin would be able to control who speaks, when and where, using switchable HUD that lists all users present.