I suggest adding the next:Retrograde circumbinary objects
That's right, we know that in binary systems there is a very compact region around each star where there is stability to harbour planets for geological time-scales, you can't be further from the star or the gravitational pull of the other would destabilize the planet. We also know that there are circumbinary planets, they encircle the entire binary system as a whole, but they need to be quite far away away from the barycenter so both stars appear as a single object and without pulling in a pulsating manner in wide directions.
But a team of astronomers have demonstrated,in a paper for theRoyal Astronomical Society,
that planets orbiting in retrograde orbits around the binary system could have a wide variety of stable orbits very close to the stars! Here you have a simple case simulation
that I really reccomend. As you can see there can be planets very very close transiting from one star to the other in a stable way for billions of years. Their obirts have poligonal-ish orbits (for example the inner planet of the simulation creates curvy triangles).
I know what you are going to say, the fact that this is possible dosen't mean it happens. The big problem here is having retrograde planets (something absurdly inprobable from the point of view of planetary formation theory). But hey, they could be captured (still improbable but something that you could probably find in SE if you searched quite a bit)!
The idea dosen't have to be about planets, it can be any object. For example, even if it's improbable there are currently tens of asteroids in the main belt whos orbit are retrograde! like the 10 km sized 2005 VD
or the smaller 2013 LA2
for example. There are millions of rocks there and is not strange to find a few that has this extremely rare characteristic. Asteroids in retrograde circumbinary obits around binary stars could survive for billions of years and they probably exist in many of these systems. So maybe asking for planets in Space Engine is asking for unrealism but asking for asteroids and comets in those kind of orbits I think is reasonable.
By the way if the binary system has regular circumbinary planets and an Oort cloudI think it would be much more probable. In the solar system we know that short period comets have adopted those orbits because of close encounters with the gas and ice giants, to have this kind of encounters you need to be in an orbit not very inclined with respect to the ecliptic, so the majority of short period comets are not any kind of Oort cloud comets, they have been selected and filtered because they had low orbital inclinations. Similar situations may arise in our binary system, the circumbinary planets could locate Exo-Oort cloud objects with little orbital inclination with respect to the binary star orbital plane in this close region. A few of those (maybe one in a million) would have retrograde orbits, but hese would survive while the others don't, so for billions of years there could be accumulated a bucnh of big rocks in those kind of strange configurations.
I would really love to see this in SE, try to imagine the sky! getting close to one star and then to the other, Just awesome.