Zoom in and out of your slide.

Customize grid lines and rulers to position your content.

Change the size and proportion of your slides.

Animate blocks such as text and images to reveal one piece of content at a time.

Create animations or transitions between your slides.

“Master slides” that can update across all decks that use them - e.g. a company intro section that needs to update across all product decks.

Combine multiple cells into one cell in a table.

The ability to add a border around images. Some images blend in with slide background. adding a border around an image would be very nice. Currently I am using drop shadows to differentiate the image with the slide background color

Presentations that fill up the full screen vertically on mobile.

This seems like an easy one for the text editor... Make it possible to format text as subscripts or superscripts.