In the SlideShow Settings there should be an ongoing number attatched to each slide to distinguish them clearly.

Background:
Ahead of our Sunday morning services we continuously run a PowerPoint of about 20 to 30 different slides of proclamations about whats on next.

Later, during the service, a moderator picks out just a few of them to tell more details about those events.
We then click the according slide in the SlideShow Settings (at that time without automatic transition).
Just a few minutes in advance we are told which slides will be picked out.

So in the SlideShow Settings it would be really, really great to have an ongoing number for each slide to distinguish them clearly.
It could be e.g. above as a kind of headline or even in a corner within the slides.

At the moment we have to write down e.g. "5/3" (5th line / 3rd column).
But of course it would be much more convenient to write down just the slide number.
Not to forget, there wont be mistakes in counting lines and columns ;-)