Not necessarily areas, but the time for events.
You will of course have your handful of main events when people are all there with their agendas, and be confronted to the timezone issue.
You can also have a lot of smaller, more dedicated events to single players or entities to make them advance the plot and unlock things, create stuff, etc. I mean, for example in Kor's event, you had the main events, and Kor also rolled with whatever (well subject to his acceptance of course, as long as it doesn't harm the event or the plot) the players came with. At some point for example, Kor asked Lyn to help him find and decipher a hidden code. That made the story advance, involved one player or a bigger entity without having to ask to everyone being present every time while still bringing RP interesting things to do for your players. And then they can even choose to do their own RP things by themselves. Lyn could have for example chosen to handle the code to someone else without Kor's consent. So it creates other opportunities as well that you don't have to take much care of yourself (just keep track of it).
Of course, it asks for a bit more work for the GM since you can potentially create a lot of those for every people.