3.

export function useIsMuteDisabled(participant?: Participant) {
  const p = useEnsureParticipant(participant);
  const observable = React.useMemo(() => createIsMuteDisabledObserver(p), [p]);
  const isMuteDisabled = useObservableState(observable, p.isMuteDisabled);

  return isMuteDisabled;
}

export function createIsMuteDisabledObserver(participant: Participant) {
  return participantEventSelector(participant, ParticipantEvent.IsMuteDisabledChanged).pipe(
    map(([isMuteDisabled]) => isMuteDisabled),
  );
}

4.a.

const isMuteDisabled = useIsMuteDisabled(room?.localParticipant)

4.b.

for (let remoteParticipant of room?.participants.values()){
        remoteParticipant.setIsMuteDisabled(true)
}

4.c.

for (let remoteParticipant of room?.participants.values()){
        remoteParticipant.setIsMuteDisabled(false)
}

Note: I tried another method by creating server using Node.js Server SDK and creating API endpoints that disables/enables publishing rights for all other participants except the caller. I then used these endpoints whenever a user mute/unmute their mic. Although it did implement intended changes, I had noticeable lags in between all of the client-server, server-LiveKitServer, server-client communications and hence wanted to try a client-side implementation. If you guys have any recommendations on this method as well, I would appreciate it!