I see that the <section> has a data-id attribute, that appears to be consistent between reloads. I wrote a little bookmarklet that can go to a slide via the ID. Of course, that won't help with the link idea.
I strongly agree. I'd like to provide people with a link to a slide that will work even if other slides are added. So slides need a unique and permanent ID.
I agree. One use case is when I change an anchor slide, and then need to use it throughout the deck. Now, I have to edit, add, duplicate, then go back to "arrange slides" and drag. It would be so much easier to Ctrl-drag or Alt-drag to do that.
I'd like a navigation/tree pane on the left too, synced with the slide being shown. It would show child items for those slides that navigate vertically. The question is what would be the text of the tree nodes? The first <h1> or <h2> found on a given slide?