Currently the complete Attendee List is accessible by the Presenter. However, the search option in the list is not yet implemented. Soon the option will be available and the process will be updated here.
Right now Full technical information of the attendees is not yet available for presenter in the Webrtc but will soon be. However, you may refer to the file attached for technical requirements to run Webrtc on any system.
No, attendees will not have any controls by default. However, if the Instructor wants, the audio-video rights for the attendees can be activated by clicking on the Mic/video camera icon next to the attendee name.