It is possible to share slide advancement amongst all panelists or co-hosts. In order to do this you have to do a little prep work. Prior to the meeting start time for attendees, you can go to file, share and upload your PowerPoint presentation. Once this is done you will notice that there are two little arrows and an annotate button on the left hand side of your screen you may have to hover in the center of the left side in order to see them. The up and down arrows will advance the slides, and all panelist should be able to do so.
There are some significant caveats to this. Your PowerPoint presentation can contain no interactive media, no animations and no transitions. None of this will be displayed.
I am hoping that the Cisco will improve this overtime oh, but have no ideas if that's in the plan.