Because of the rather linear and semi-automatic way that PrE (even PrE 7) authors a DVD, it will not do what you want.
If your images are stills, I'd suggest that you look at ProShow Gold (or Producer) for SlideShow creation.
If you have video, you might want to check out DVD Architect, for authoring. You'll probably have to do some custom Menus, and have the DVD "pause" on those, but you'll be able to control things much more.
DVD Studio Pro can do this, but it's a US$275 program.
Yes, Encore can do this. I had not mentioned it, as it has only been available bundled with PrPro, as of CS3.
Now, if one could find Encore 2.0 (I'd not go any earlier), and it will run on one's OS, that would be a good deal.
In Encore, one would just have a Menu (the pause) with a hidden Button. The speaker/presenter would then just hit Enter on the remote to go to the next segment. If one wanted more than one selection, then the Buttons would NOT be hidden, but could be navigated to by the speaker/presenter.
Too bad that Adobe chose to only sell Encore in a bundle.