Do you not like the Katzenartig Imperium, and don't want to have to disable it every game? Well then just use this!
This handy little submod will make it so Jublio and Jupitwo (Flusion and the Corronians' systems, respectively), will not spawn at all if the Imperium is set to Enabled or Disabled.
However, they will still spawn if it is set to Guaranteed or any higher Kaiser difficulty, but this should ensure you don't accidentally leave them on by mistake.
Put this mod below Gigastructural Engineering & More for it to work.