Procedural civilizations I think is impossible, but it wouldn't be improbable as add-ons/ mods. At it's simplest and effectiveness at the moment would be megastructures, dyson structures and maybe space faring vessels. I would be more interested in seeing models of things like the ISS, or code to enable adding stations in orbit.
Procedural life, would that be the same as possibly No Man's Sky? As much as seeing intelligent life as technological would be cool, I would find creatures more interesting. I know NMS use mathematical algorithms to spawn life. Is that something that isn't possible in the Space Engine coding?
according to my research, the engine used by space engine is different from that of no man's sky, the addition of living creatures would pose a lot of optimization problem, moreover, it is very difficult to set up an algorithm simulating the evolution Darwinian, especially when you have to simulate millions of years of evolution. I don't think it's within the reach of a personal computer. optimization is already difficult, such an opening would make it impossible. no man's sky uses already implanted creatures, eventually breaking the immersion due to inconsistencies.