I would love to see analogs for these Asteroid belt objects: (Juno, Iris, Hebe, Hygiea, and Astraea) and the Centaurs: (Chiron, Pholus, and Nessus). The inner system needs some love too don't you agree? Since the MPE has the outer system mostly filled out already, Orcus, Ixion, Quaoar, Varuna, Salacia, Chaos, Varda, and Gonggong, are the only ones* missing so far. In total that is 17 (6 inner, 3 mid-range, and 8 outer) main dwarf bodies and however many small moons for some of them.
(*Actually big enough to be considered the top dwarfs planets, some have moons, and have 1 name to go by to make it easier on the reader with the number Salad.)
MPE, JMP, and OPM with the Custom Asteroids mod would be something to behold. Can't wait for KSP2 to be available so we can update the mods and send them there as well!