Now that we have interstellar planets wouln't interstellar comets and asteroids be an interesting addition?
I know its quite useless (since probable would make the engine slower when loading and since you woulnd't really have the tools to search for them in the first place right now). In principle this is like that, pointless. But let me convince you with some arguments.
Realism argument:
Interstellar minor bodies exist (we
only have observed one but we know that they have to exist). According to
this research paper there has to be around 1 trillion comets per cubic parsec in interstellar space. And
accordign to this one there could be 10 times more density of interstellar comets. So SpaceEngine, having realism as a central idea, should have this feature one day.
"They are here" argument:
Not only we now know that these objects can be crossing stellar systems (maybe I could go to Sirius and see an interstellar asteroid traversing between the planets), but also there is now an estimate of the density of objects like the one detected currently in our Solar System.
300.000 interstellar asteroids could be right now inside the orbit of
V774104 (~100 AU from the Sun). These objects could be illuminated in Space Engine because they are travelling through the Solar System as any other object but with random and extreme trajectories.
Historic landmark argument:
Now that we know about an interstellar visitor to the Solar System it would be awesome to have part of it's path represented in SE (maybe some thousand years in the past and future) so as to reenact the historic flyby. Also
there are ideas to chase it so why not make people try it with space probes in SE?. As a planetarium we should include things like this for educational purposes.
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Extra fun fact!
We have determined the aproximate shape of the interstellar object that came a few days ago. It is elongated been 180x30x30 meters. The European Southern Observatory has released this artistic impression of the object. Quite alien right?