Slide navigation
Ability to more easily move around and navigate slides. Right now, if you want to move one slide all the way to the end, it takes a long time to slowly move it slide by slide over to the right or left.
Similarly, ability to quickly navigate through the deck more quickly. Having to flip page by page to get to my last slide where i decided I want to make edits, and then going back to where I was another 20 slides back one by one, becomes cumbersome.

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AdminHakim (Co-founder, Slides) commented
Thanks for the feedback! We completely agree that the current way of rearranging slides leaves a lot to be desired. Especially for decks with a lot of slides. We have it on our todo list to switch to a more traditional drag and drop interface which should make this a better experience. Paired with that, we want to change the layout of slides when arranging from the current horizontal strip to a grid of slides that makes better use of the available space.
Presenting all slides in a grid should be a good way to allow quicker navigation outside of the editor too.