Well, I’ve come around to having some additional navigation links in presentation mode.
See the latest beta.
I’ve put three symbols all the way to the right side (i.e., the end) of the horizontal rule separating the title from the body. I’ve got a down arrow (to take you to the next slide), an up arrow (to go back to the previous slide), and a home symbol (to take you back to the first slide).
The placement and the styling seem to make these suitably inconspicuous (so they don’t visually compete with your presentation materials), yet consistently available in the same location on every slide.
Let me know how this works for you!