[derwildemomo]

Ha, I'd actually love that. Google Slides should be in the realm of possible things, PPTX could get more complicated.

What I suggest you try is to upload a PDF. I've built a moderator mode on the presenting screen, there you can do exactly what you want (just not with a PPT but with a PDF-Presentation).

The reason is that PDF can be rendered very consistently across platforms, this is more problematic with Powerpoint and friends.