I'm looking for this feature as well. This is definitely a missing feature in comparison to GoToMeeting. In GTM it's called a Co-Organizer. Our organization is going to really miss this feature once we make this switch.
My use case: I am setting up a call for myself, a teammate, and a customer. I want my teammate to be able to start the meeting without me or if I cannot make it. But I don't want the meeting to start if the customer signs in before either of us. I have several meetings like this with different teammates for different customers. In other cases, I am holding meetings where I definitely need to kick it off and in those cases I would not establish a co-organizer.