Bit surprised to hear that this is not a feature yet, as I would consider this a far more basic feature than, say, simulating explosions (especially for educational purposes, which is one major value of this software).
I believe SpaceEngine has that feature (which is perhaps what you found).
In Universe Sandbox ², we put an emphasis on simulation and interactivity. Software like SpaceEngine is great for touring our known universe (and that may be precisely what some are looking for), but with Universe Sandbox ², we're more interested in asking fantastical questions and conducting experiments.
For example, you can ask questions like "What if the Sun disappeared?" and see how the planets of our solar system lose their orbits and Earth freezes over. This isn't possible in other software where things like gravity and temperature aren't simulated.
That said, we agree that guided tours certainly can have educational value, and we've talked about adding something like that in the future. A crude way of accomplishing this in Universe Sandbox ² right now would be to save a simulation for every stop you have in mind, then you could progress through this series of sims. But the ability to set up automated cameras, events, and text boxes would definitely help with the immersion.